diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2e7013ee..039f8e22 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@
 
 ### 2.3.0 <small>WIP</small> { id="2.3.0" }
 
+- (!) feat: Reference specifiers [#585](https://github.com/mpusz/mp-units/pull/585)
+
 ### 2.2.0 <small>June 14, 2024</small> { id="2.2.0" }
 
 - (!) feat: C++ modules support added by [@JohelEGP](https://github.com/JohelEGP)
diff --git a/docs/getting_started/quick_start.md b/docs/getting_started/quick_start.md
index 4a76744f..1047b6ef 100644
--- a/docs/getting_started/quick_start.md
+++ b/docs/getting_started/quick_start.md
@@ -238,7 +238,7 @@ This introduces an additional type-safety.
       using namespace mp_units::si::unit_symbols;
       using namespace mp_units::usc::unit_symbols;
 
-      quantity_point temp{20. * deg_C};
+      quantity_point temp = 20. * absolute<deg_C>;
       std::println("Temperature: {} ({})",
                    temp.quantity_from_zero(),
                    temp.in(deg_F).quantity_from_zero());
@@ -259,7 +259,7 @@ This introduces an additional type-safety.
       using namespace mp_units::si::unit_symbols;
       using namespace mp_units::usc::unit_symbols;
 
-      quantity_point temp{20. * deg_C};
+      quantity_point temp = 20. * absolute<deg_C>;
       std::println("Temperature: {} ({})",
                    temp.quantity_from_zero(),
                    temp.in(deg_F).quantity_from_zero());
diff --git a/docs/users_guide/framework_basics/design_overview.md b/docs/users_guide/framework_basics/design_overview.md
index 04857726..530cb7a5 100644
--- a/docs/users_guide/framework_basics/design_overview.md
+++ b/docs/users_guide/framework_basics/design_overview.md
@@ -378,5 +378,5 @@ For example:
   the previous example:
 
   ```cpp
-  constexpr auto room_reference_temperature = ice_point + isq::Celsius_temperature(21 * deg_C);
+  constexpr auto room_reference_temperature = ice_point + isq::Celsius_temperature(21 * delta<deg_C>);
   ```
diff --git a/docs/users_guide/framework_basics/the_affine_space.md b/docs/users_guide/framework_basics/the_affine_space.md
index 54fe7cf2..9e71aaae 100644
--- a/docs/users_guide/framework_basics/the_affine_space.md
+++ b/docs/users_guide/framework_basics/the_affine_space.md
@@ -3,7 +3,7 @@
 The affine space has two types of entities:
 
 - **_Point_** - a position specified with coordinate values (e.g., location, address, etc.)
-- **_Displacement vectors_** - the difference between two points (e.g., shift, offset,
+- **_Displacement vector_** - the difference between two points (e.g., shift, offset,
   displacement, duration, etc.)
 
 In the following subchapters, we will often refer to _displacement vectors_ simply as _vectors_ for
@@ -70,6 +70,49 @@ difference between two things:
 As we already know, a `quantity` type provides all operations required for a _displacement vector_
 abstraction in an affine space.
 
+Quantities are constructed from a delta quantity reference. Most of units are considered to be
+delta references by default. The ones that need a special qualification are the units that
+get a point origin in their definition (i.e., units of temperature).
+
+We can create a `quantity` by passing a delta quantity reference to either:
+
+- two-parameter constructor:
+
+    ```cpp
+    quantity q1(42, si::metre);
+    // quantity q2(42, si::kelvin);             // Compile-time error
+    // quantity q3(42, si::degree_Celsius);     // Compile-time error
+    // quantity q4(42, usc::degree_Fahrenheit); // Compile-time error
+    quantity q5(42, delta<si::metre>);
+    quantity q6(42, delta<si::kelvin>);
+    quantity q7(42, delta<si::degree_Celsius>);
+    quantity q8(42, delta<usc::degree_Fahrenheit>);
+    ```
+
+- multiply syntax:
+
+    ```cpp
+    quantity q1 = 42 * m;
+    // quantity q2 = 42 * K;      // Compile-time error
+    // quantity q3 = 42 * deg_C;  // Compile-time error
+    // quantity q4 = 42 * deg_F;  // Compile-time error
+    quantity q5 = 42 * delta<m>;
+    quantity q6 = 42 * delta<K>;
+    quantity q7 = 42 * delta<deg_C>;
+    quantity q8 = 42 * delta<deg_F>;
+    ```
+
+!!! note
+
+    `delta` specifier is used to qualify the entire reference upon `quantity` construction.
+    It does not satisfy the [`Reference`](concepts.md#Reference) concept. This means that,
+    for example, the below are ill-formed:
+
+    ```cpp
+    void foo(quantity<delta<si::degree_Celsius>> temp);              // ill-formed
+    quantity<N * m / (delta<deg_C> * mol)> specific_heat_capacity;   // ill-formed
+    quantity R = 8.314 * N * m / (delta<deg_C> * mol);               // ill-formed
+    ```
 
 ## _Point_ is modeled by `quantity_point` and `PointOrigin`
 
@@ -109,6 +152,19 @@ scale zeroth point using the following rules:
 - otherwise, an instantiation of `zeroth_point_origin<QuantitySpec>` is being used which
   provides a well-established zeroth point for a specific quantity type.
 
+Quantity points with default point origins may be constructed using multiply syntax from an
+absolute quantity reference. None of units are considered to be absolute references by default,
+so they need a special qualification:
+
+```cpp
+// quantity_point qp1 = 42 * m;      // Compile-time error
+// quantity_point qp2 = 42 * K;      // Compile-time error
+// quantity_point qp3 = 42 * deg_C;  // Compile-time error
+quantity_point qp4 = 42 * absolute<m>;
+quantity_point qp5 = 42 * absolute<K>;
+quantity_point qp6 = 42 * absolute<deg_C>;
+```
+
 !!! tip
 
     The `quantity_point` definition can be found in the `mp-units/quantity_point.h` header file.
@@ -124,8 +180,8 @@ for this domain.
 ![affine_space_1](affine_space_1.svg){style="width:80%;display: block;margin: 0 auto;"}
 
 ```cpp
-quantity_point<isq::distance[si::metre]> qp1{100 * m};
-quantity_point<isq::distance[si::metre]> qp2{120 * m};
+quantity_point<isq::distance[si::metre]> qp1 = 100 * absolute<m>;
+quantity_point<isq::distance[si::metre]> qp2 = 120 * absolute<m>;
 
 assert(qp1.quantity_from_zero() == 100 * m);
 assert(qp2.quantity_from_zero() == 120 * m);
@@ -174,8 +230,8 @@ origin.
 ```cpp
 inline constexpr struct origin final : absolute_point_origin<isq::distance> {} origin;
 
-// quantity_point<si::metre, origin> qp1{100 * m};  // Compile-time error
-// quantity_point<si::metre, origin> qp2{120 * m};  // Compile-time error
+// quantity_point<si::metre, origin> qp1{100 * m};             // Compile-time error
+// quantity_point<si::metre, origin> qp2 = 120 * absolute<m>;  // Compile-time error
 quantity_point<si::metre, origin> qp1 = origin + 100 * m;
 quantity_point<si::metre, origin> qp2 = 120 * m + origin;
 
@@ -387,7 +443,7 @@ namespace si {
 inline constexpr struct absolute_zero final : absolute_point_origin<isq::thermodynamic_temperature> {} absolute_zero;
 inline constexpr auto zeroth_kelvin = absolute_zero;
 
-inline constexpr struct ice_point final : relative_point_origin<quantity_point{273'150 * milli<kelvin>}> {} ice_point;
+inline constexpr struct ice_point final : relative_point_origin<273'150 * absolute<milli<kelvin>>>> {} ice_point;
 inline constexpr auto zeroth_degree_Celsius = ice_point;
 
 }
@@ -395,7 +451,7 @@ inline constexpr auto zeroth_degree_Celsius = ice_point;
 namespace usc {
 
 inline constexpr struct zeroth_degree_Fahrenheit final :
-  relative_point_origin<quantity_point{-32 * (mag_ratio<5, 9> * si::degree_Celsius)}> {} zeroth_degree_Fahrenheit;
+  relative_point_origin<-32 * absolute<mag_ratio<5, 9> * si::degree_Celsius>> {} zeroth_degree_Fahrenheit;
 
 }
 ```
@@ -444,25 +500,28 @@ choose from here. Depending on our needs or tastes, we can:
 - be explicit about the unit and origin:
 
     ```cpp
-    quantity_point<si::degree_Celsius, si::zeroth_degree_Celsius> q1 = si::zeroth_degree_Celsius + 20.5 * deg_C;
-    quantity_point<si::degree_Celsius, si::zeroth_degree_Celsius> q2 = {20.5 * deg_C, si::zeroth_degree_Celsius};
-    quantity_point<si::degree_Celsius, si::zeroth_degree_Celsius> q3{20.5 * deg_C};
+    quantity_point<si::degree_Celsius, si::zeroth_degree_Celsius> q1 = si::zeroth_degree_Celsius + 20.5 * delta<deg_C>;
+    quantity_point<si::degree_Celsius, si::zeroth_degree_Celsius> q2 = {20.5 * delta<deg_C>, si::zeroth_degree_Celsius};
+    quantity_point<si::degree_Celsius, si::zeroth_degree_Celsius> q3{20.5 * delta<deg_C>};
+    quantity_point<si::degree_Celsius, si::zeroth_degree_Celsius> q4 = 20.5 * absolute<deg_C>;
     ```
 
 - specify a unit and use its zeroth point origin implicitly:
 
     ```cpp
-    quantity_point<si::degree_Celsius> q4 = si::zeroth_degree_Celsius + 20.5 * deg_C;
-    quantity_point<si::degree_Celsius> q5 = {20.5 * deg_C, si::zeroth_degree_Celsius};
-    quantity_point<si::degree_Celsius> q6{20.5 * deg_C};
+    quantity_point<si::degree_Celsius> q5 = si::zeroth_degree_Celsius + 20.5 * delta<deg_C>;
+    quantity_point<si::degree_Celsius> q6 = {20.5 * delta<deg_C>, si::zeroth_degree_Celsius};
+    quantity_point<si::degree_Celsius> q7{20.5 * delta<deg_C>};
+    quantity_point<si::degree_Celsius> q8 = 20.5 * absolute<deg_C>;
     ```
 
 - benefit from CTAD:
 
     ```cpp
-    quantity_point q7 = si::zeroth_degree_Celsius + 20.5 * deg_C;
-    quantity_point q8 = {20.5 * deg_C, si::zeroth_degree_Celsius};
-    quantity_point q9{20.5 * deg_C};
+    quantity_point q9 = si::zeroth_degree_Celsius + 20.5 * delta<deg_C>;
+    quantity_point q10 = {20.5 * delta<deg_C>, si::zeroth_degree_Celsius};
+    quantity_point q11{20.5 * delta<deg_C>};
+    quantity_point q12 = 20.5 * absolute<deg_C>;
     ```
 
 In all of the above cases, we end up with the `quantity_point` of the same type and value.
@@ -473,10 +532,10 @@ the following way:
 ![affine_space_6](affine_space_6.svg){style="width:80%;display: block;margin: 0 auto;"}
 
 ```cpp
-constexpr struct room_reference_temp final : relative_point_origin<quantity_point{21 * deg_C}> {} room_reference_temp;
+constexpr struct room_reference_temp final : relative_point_origin<21 * absolute<deg_C>> {} room_reference_temp;
 using room_temp = quantity_point<isq::Celsius_temperature[deg_C], room_reference_temp>;
 
-constexpr auto step_delta = isq::Celsius_temperature(0.5 * deg_C);
+constexpr auto step_delta = isq::Celsius_temperature(0.5 * delta<deg_C>);
 constexpr int number_of_steps = 6;
 
 room_temp room_ref{};
diff --git a/example/kalman_filter/kalman_filter-example_6.cpp b/example/kalman_filter/kalman_filter-example_6.cpp
index 2dc55ba1..82a337ce 100644
--- a/example/kalman_filter/kalman_filter-example_6.cpp
+++ b/example/kalman_filter/kalman_filter-example_6.cpp
@@ -62,12 +62,13 @@ int main()
   using estimate = kalman::system_state_estimate<qp>;
   using state = estimate::state_type;
 
-  const quantity process_noise_variance = 0.0001 * pow<2>(deg_C);
-  const estimate initial{state{qp{60. * deg_C}}, 100. * deg_C};
-  const std::array measurements = {qp{49.986 * deg_C}, qp{49.963 * deg_C}, qp{50.097 * deg_C}, qp{50.001 * deg_C},
-                                   qp{50.018 * deg_C}, qp{50.05 * deg_C},  qp{49.938 * deg_C}, qp{49.858 * deg_C},
-                                   qp{49.965 * deg_C}, qp{50.114 * deg_C}};
-  const quantity measurement_error = 0.1 * deg_C;
+  const quantity process_noise_variance = 0.0001 * delta<pow<2>(deg_C)>;
+  const estimate initial{state{qp{60. * delta<deg_C>}}, 100. * delta<deg_C>};
+  const std::array measurements = {qp{49.986 * delta<deg_C>}, qp{49.963 * delta<deg_C>}, qp{50.097 * delta<deg_C>},
+                                   qp{50.001 * delta<deg_C>}, qp{50.018 * delta<deg_C>}, qp{50.05 * delta<deg_C>},
+                                   qp{49.938 * delta<deg_C>}, qp{49.858 * delta<deg_C>}, qp{49.965 * delta<deg_C>},
+                                   qp{50.114 * delta<deg_C>}};
+  const quantity measurement_error = 0.1 * delta<deg_C>;
   const quantity measurement_variance = pow<2>(measurement_error);
 
   auto predict = [=](const estimate& current) {
diff --git a/example/kalman_filter/kalman_filter-example_7.cpp b/example/kalman_filter/kalman_filter-example_7.cpp
index 62ce652b..7fe1a9ac 100644
--- a/example/kalman_filter/kalman_filter-example_7.cpp
+++ b/example/kalman_filter/kalman_filter-example_7.cpp
@@ -62,12 +62,13 @@ int main()
   using estimate = kalman::system_state_estimate<qp>;
   using state = estimate::state_type;
 
-  const quantity process_noise_variance = 0.0001 * pow<2>(deg_C);
-  const estimate initial{state{qp{10. * deg_C}}, 100. * deg_C};
-  const std::array measurements = {qp{50.486 * deg_C}, qp{50.963 * deg_C}, qp{51.597 * deg_C}, qp{52.001 * deg_C},
-                                   qp{52.518 * deg_C}, qp{53.05 * deg_C},  qp{53.438 * deg_C}, qp{53.858 * deg_C},
-                                   qp{54.465 * deg_C}, qp{55.114 * deg_C}};
-  const quantity measurement_error = 0.1 * deg_C;
+  const quantity process_noise_variance = 0.0001 * delta<pow<2>(deg_C)>;
+  const estimate initial{state{qp{10. * delta<deg_C>}}, 100. * delta<deg_C>};
+  const std::array measurements = {qp{50.486 * delta<deg_C>}, qp{50.963 * delta<deg_C>}, qp{51.597 * delta<deg_C>},
+                                   qp{52.001 * delta<deg_C>}, qp{52.518 * delta<deg_C>}, qp{53.05 * delta<deg_C>},
+                                   qp{53.438 * delta<deg_C>}, qp{53.858 * delta<deg_C>}, qp{54.465 * delta<deg_C>},
+                                   qp{55.114 * delta<deg_C>}};
+  const quantity measurement_error = 0.1 * delta<deg_C>;
   const quantity measurement_variance = pow<2>(measurement_error);
 
   auto predict = [=](const estimate& current) {
diff --git a/example/kalman_filter/kalman_filter-example_8.cpp b/example/kalman_filter/kalman_filter-example_8.cpp
index 760212ec..158f54a9 100644
--- a/example/kalman_filter/kalman_filter-example_8.cpp
+++ b/example/kalman_filter/kalman_filter-example_8.cpp
@@ -62,12 +62,13 @@ int main()
   using estimate = kalman::system_state_estimate<qp>;
   using state = estimate::state_type;
 
-  const quantity process_noise_variance = 0.15 * pow<2>(deg_C);
-  const estimate initial{state{qp{10. * deg_C}}, 100. * deg_C};
-  const std::array measurements = {qp{50.486 * deg_C}, qp{50.963 * deg_C}, qp{51.597 * deg_C}, qp{52.001 * deg_C},
-                                   qp{52.518 * deg_C}, qp{53.05 * deg_C},  qp{53.438 * deg_C}, qp{53.858 * deg_C},
-                                   qp{54.465 * deg_C}, qp{55.114 * deg_C}};
-  const quantity measurement_error = 0.1 * deg_C;
+  const quantity process_noise_variance = 0.15 * delta<pow<2>(deg_C)>;
+  const estimate initial{state{qp{10. * delta<deg_C>}}, 100. * delta<deg_C>};
+  const std::array measurements = {qp{50.486 * delta<deg_C>}, qp{50.963 * delta<deg_C>}, qp{51.597 * delta<deg_C>},
+                                   qp{52.001 * delta<deg_C>}, qp{52.518 * delta<deg_C>}, qp{53.05 * delta<deg_C>},
+                                   qp{53.438 * delta<deg_C>}, qp{53.858 * delta<deg_C>}, qp{54.465 * delta<deg_C>},
+                                   qp{55.114 * delta<deg_C>}};
+  const quantity measurement_error = 0.1 * delta<deg_C>;
   const quantity measurement_variance = pow<2>(measurement_error);
 
   auto predict = [=](const estimate& current) {
diff --git a/example/spectroscopy_units.cpp b/example/spectroscopy_units.cpp
index e64eee8f..068ed14d 100644
--- a/example/spectroscopy_units.cpp
+++ b/example/spectroscopy_units.cpp
@@ -84,7 +84,7 @@ int main()
   const auto t3 = std::make_tuple(isq::energy(q3 * h), isq::wavenumber(q3 / c), q3,
                                   isq::thermodynamic_temperature(q3 * h / kb), isq::wavelength(c / q3));
 
-  const auto q4 = isq::thermodynamic_temperature(1. * K);
+  const auto q4 = isq::thermodynamic_temperature(1. * delta<K>);
   const auto t4 = std::make_tuple(isq::energy(q4 * kb), isq::wavenumber(q4 * kb / (h * c)), isq::frequency(q4 * kb / h),
                                   q4, isq::wavelength(h * c / (q4 * kb)));
 
diff --git a/src/core/include/mp-units/bits/sudo_cast.h b/src/core/include/mp-units/bits/sudo_cast.h
index 0444f93e..5a79f2e6 100644
--- a/src/core/include/mp-units/bits/sudo_cast.h
+++ b/src/core/include/mp-units/bits/sudo_cast.h
@@ -97,10 +97,10 @@ template<Quantity To, typename From>
   if constexpr (q_unit == To::unit) {
     // no scaling of the number needed
     return {static_cast<MP_UNITS_TYPENAME To::rep>(std::forward<From>(q).numerical_value_is_an_implementation_detail_),
-            To::reference};  // this is the only (and recommended) way to do
-                             // a truncating conversion on a number, so we are
-                             // using static_cast to suppress all the compiler
-                             // warnings on conversions
+            delta<To::reference>};  // this is the only (and recommended) way to do
+                                    // a truncating conversion on a number, so we are
+                                    // using static_cast to suppress all the compiler
+                                    // warnings on conversions
   } else {
     // scale the number
     using traits = magnitude_conversion_traits<To, std::remove_reference_t<From>>;
@@ -108,13 +108,13 @@ template<Quantity To, typename From>
       // this results in great assembly
       auto res = static_cast<MP_UNITS_TYPENAME To::rep>(
         static_cast<traits::c_type>(q.numerical_value_is_an_implementation_detail_) * traits::ratio);
-      return {res, To::reference};
+      return {res, delta<To::reference>};
     } else {
       // this is slower but allows conversions like 2000 m -> 2 km without loosing data
       auto res = static_cast<MP_UNITS_TYPENAME To::rep>(
         static_cast<traits::c_type>(q.numerical_value_is_an_implementation_detail_) * traits::num_mult /
         traits::den_mult * traits::irr_mult);
-      return {res, To::reference};
+      return {res, delta<To::reference>};
     }
   }
 }
@@ -175,5 +175,4 @@ template<QuantityPoint ToQP, typename FromQP>
   }
 }
 
-
 }  // namespace mp_units::detail
diff --git a/src/core/include/mp-units/framework/quantity.h b/src/core/include/mp-units/framework/quantity.h
index 587ab2a2..014e9e8e 100644
--- a/src/core/include/mp-units/framework/quantity.h
+++ b/src/core/include/mp-units/framework/quantity.h
@@ -88,6 +88,13 @@ template<typename Func, Quantity Q1, Quantity Q2>
 using common_quantity_for = quantity<common_reference(Q1::reference, Q2::reference),
                                      std::invoke_result_t<Func, typename Q1::rep, typename Q2::rep>>;
 
+template<auto T, auto R>
+concept SameOriginalReferenceAs = DeltaReference<MP_UNITS_REMOVE_CONST(decltype(T))> &&
+                                  Reference<MP_UNITS_REMOVE_CONST(decltype(R))> && (get_original_reference(T) == R);
+
+template<auto R1, auto R2, typename Rep1, typename Rep2>
+concept SameValueAs = detail::SameOriginalReferenceAs<R1, R2> && std::same_as<Rep1, Rep2>;
+
 }  // namespace detail
 
 MP_UNITS_EXPORT_BEGIN
@@ -117,25 +124,25 @@ public:
   [[nodiscard]] static constexpr quantity zero() noexcept
     requires requires { quantity_values<rep>::zero(); }
   {
-    return {quantity_values<rep>::zero(), R};
+    return {quantity_values<rep>::zero(), delta<R>};
   }
 
   [[nodiscard]] static constexpr quantity one() noexcept
     requires requires { quantity_values<rep>::one(); }
   {
-    return {quantity_values<rep>::one(), R};
+    return {quantity_values<rep>::one(), delta<R>};
   }
 
   [[nodiscard]] static constexpr quantity min() noexcept
     requires requires { quantity_values<rep>::min(); }
   {
-    return {quantity_values<rep>::min(), R};
+    return {quantity_values<rep>::min(), delta<R>};
   }
 
   [[nodiscard]] static constexpr quantity max() noexcept
     requires requires { quantity_values<rep>::max(); }
   {
-    return {quantity_values<rep>::max(), R};
+    return {quantity_values<rep>::max(), delta<R>};
   }
 
   // construction, assignment, destruction
@@ -144,15 +151,18 @@ public:
   quantity(quantity&&) = default;
   ~quantity() = default;
 
-  template<typename Value>
-    requires std::same_as<std::remove_cvref_t<Value>, Rep>
-  constexpr quantity(Value&& v, decltype(R)) : numerical_value_is_an_implementation_detail_(std::forward<Value>(v))
+  template<typename Value, DeltaReference R2>
+    requires detail::SameValueAs<R2{}, R, std::remove_cvref_t<Value>, Rep>
+  constexpr quantity(Value&& v, R2) : numerical_value_is_an_implementation_detail_(std::forward<Value>(v))
   {
   }
 
-  template<typename Value, Reference R2>
-    requires detail::QuantityConvertibleTo<quantity<R2{}, std::remove_cvref_t<Value>>, quantity>
-  constexpr quantity(Value&& v, R2) : quantity(quantity<R2{}, std::remove_cvref_t<Value>>{std::forward<Value>(v), R2{}})
+  template<typename Value, DeltaReference R2>
+    requires(!detail::SameValueAs<R2{}, R, std::remove_cvref_t<Value>, Rep>) &&
+            detail::QuantityConvertibleTo<quantity<detail::get_original_reference(R2{}), std::remove_cvref_t<Value>>,
+                                          quantity>
+  constexpr quantity(Value&& v, R2) :
+      quantity(quantity<detail::get_original_reference(R2{}), std::remove_cvref_t<Value>>{std::forward<Value>(v), R2{}})
   {
   }
 
@@ -171,8 +181,8 @@ public:
                                           convert_explicitly> ||
                      // NOLINTNEXTLINE(google-explicit-constructor, hicpp-explicit-conversions)
                      !std::convertible_to<typename quantity_like_traits<Q>::rep, Rep>) quantity(const Q& q) :
-      quantity(
-        ::mp_units::quantity{quantity_like_traits<Q>::to_numerical_value(q).value, quantity_like_traits<Q>::reference})
+      quantity(::mp_units::quantity{quantity_like_traits<Q>::to_numerical_value(q).value,
+                                    delta<quantity_like_traits<Q>::reference>})
   {
   }
 
@@ -266,7 +276,7 @@ public:
       } -> std::common_with<rep>;
     }
   {
-    return ::mp_units::quantity{+numerical_value_is_an_implementation_detail_, reference};
+    return ::mp_units::quantity{+numerical_value_is_an_implementation_detail_, delta<reference>};
   }
 
   [[nodiscard]] constexpr QuantityOf<quantity_spec> auto operator-() const
@@ -276,7 +286,7 @@ public:
       } -> std::common_with<rep>;
     }
   {
-    return ::mp_units::quantity{-numerical_value_is_an_implementation_detail_, reference};
+    return ::mp_units::quantity{-numerical_value_is_an_implementation_detail_, delta<reference>};
   }
 
   template<typename Q>
@@ -298,7 +308,7 @@ public:
       } -> std::common_with<rep>;
     }
   {
-    return ::mp_units::quantity{numerical_value_is_an_implementation_detail_++, reference};
+    return ::mp_units::quantity{numerical_value_is_an_implementation_detail_++, delta<reference>};
   }
 
   template<typename Q>
@@ -320,7 +330,7 @@ public:
       } -> std::common_with<rep>;
     }
   {
-    return ::mp_units::quantity{numerical_value_is_an_implementation_detail_--, reference};
+    return ::mp_units::quantity{numerical_value_is_an_implementation_detail_--, delta<reference>};
   }
 
   // compound assignment operators
@@ -419,9 +429,9 @@ public:
 };
 
 // CTAD
-template<typename Value, Reference R>
-  requires RepresentationOf<Value, get_quantity_spec(R{}).character>
-quantity(Value v, R) -> quantity<R{}, Value>;
+template<typename Value, DeltaReference R>
+  requires RepresentationOf<Value, get_quantity_spec(detail::get_original_reference(R{})).character>
+quantity(Value v, R) -> quantity<detail::get_original_reference(R{}), Value>;
 
 template<QuantityLike Q>
 explicit(
@@ -437,7 +447,7 @@ template<auto R1, typename Rep1, auto R2, typename Rep2>
   const ret ret_lhs(lhs);
   const ret ret_rhs(rhs);
   return quantity{ret_lhs.numerical_value_ref_in(ret::unit) + ret_rhs.numerical_value_ref_in(ret::unit),
-                  ret::reference};
+                  delta<ret::reference>};
 }
 
 template<auto R1, typename Rep1, auto R2, typename Rep2>
@@ -448,7 +458,7 @@ template<auto R1, typename Rep1, auto R2, typename Rep2>
   const ret ret_lhs(lhs);
   const ret ret_rhs(rhs);
   return quantity{ret_lhs.numerical_value_ref_in(ret::unit) - ret_rhs.numerical_value_ref_in(ret::unit),
-                  ret::reference};
+                  delta<ret::reference>};
 }
 
 template<auto R1, typename Rep1, auto R2, typename Rep2>
@@ -461,14 +471,14 @@ template<auto R1, typename Rep1, auto R2, typename Rep2>
   const ret ret_lhs(lhs);
   const ret ret_rhs(rhs);
   return quantity{ret_lhs.numerical_value_ref_in(ret::unit) % ret_rhs.numerical_value_ref_in(ret::unit),
-                  ret::reference};
+                  delta<ret::reference>};
 }
 
 template<auto R1, typename Rep1, auto R2, typename Rep2>
   requires detail::InvocableQuantities<std::multiplies<>, quantity<R1, Rep1>, quantity<R2, Rep2>>
 [[nodiscard]] constexpr Quantity auto operator*(const quantity<R1, Rep1>& lhs, const quantity<R2, Rep2>& rhs)
 {
-  return quantity{lhs.numerical_value_ref_in(get_unit(R1)) * rhs.numerical_value_ref_in(get_unit(R2)), R1 * R2};
+  return quantity{lhs.numerical_value_ref_in(get_unit(R1)) * rhs.numerical_value_ref_in(get_unit(R2)), delta<R1 * R2>};
 }
 
 template<auto R, typename Rep, typename Value>
@@ -476,7 +486,7 @@ template<auto R, typename Rep, typename Value>
           detail::InvokeResultOf<get_quantity_spec(R).character, std::multiplies<>, Rep, const Value&>
 [[nodiscard]] constexpr QuantityOf<get_quantity_spec(R)> auto operator*(const quantity<R, Rep>& q, const Value& v)
 {
-  return quantity{q.numerical_value_ref_in(get_unit(R)) * v, R};
+  return quantity{q.numerical_value_ref_in(get_unit(R)) * v, delta<R>};
 }
 
 template<typename Value, auto R, typename Rep>
@@ -484,7 +494,7 @@ template<typename Value, auto R, typename Rep>
           detail::InvokeResultOf<get_quantity_spec(R).character, std::multiplies<>, const Value&, Rep>
 [[nodiscard]] constexpr QuantityOf<get_quantity_spec(R)> auto operator*(const Value& v, const quantity<R, Rep>& q)
 {
-  return quantity{v * q.numerical_value_ref_in(get_unit(R)), R};
+  return quantity{v * q.numerical_value_ref_in(get_unit(R)), delta<R>};
 }
 
 template<auto R1, typename Rep1, auto R2, typename Rep2>
@@ -492,7 +502,7 @@ template<auto R1, typename Rep1, auto R2, typename Rep2>
 [[nodiscard]] constexpr Quantity auto operator/(const quantity<R1, Rep1>& lhs, const quantity<R2, Rep2>& rhs)
 {
   MP_UNITS_EXPECTS_DEBUG(rhs != rhs.zero());
-  return quantity{lhs.numerical_value_ref_in(get_unit(R1)) / rhs.numerical_value_ref_in(get_unit(R2)), R1 / R2};
+  return quantity{lhs.numerical_value_ref_in(get_unit(R1)) / rhs.numerical_value_ref_in(get_unit(R2)), delta<R1 / R2>};
 }
 
 template<auto R, typename Rep, typename Value>
@@ -501,7 +511,7 @@ template<auto R, typename Rep, typename Value>
 [[nodiscard]] constexpr QuantityOf<get_quantity_spec(R)> auto operator/(const quantity<R, Rep>& q, const Value& v)
 {
   MP_UNITS_EXPECTS_DEBUG(v != quantity_values<Value>::zero());
-  return quantity{q.numerical_value_ref_in(get_unit(R)) / v, R};
+  return quantity{q.numerical_value_ref_in(get_unit(R)) / v, delta<R>};
 }
 
 template<typename Value, auto R, typename Rep>
@@ -510,7 +520,7 @@ template<typename Value, auto R, typename Rep>
 [[nodiscard]] constexpr QuantityOf<inverse(get_quantity_spec(R))> auto operator/(const Value& v,
                                                                                  const quantity<R, Rep>& q)
 {
-  return quantity{v / q.numerical_value_ref_in(get_unit(R)), ::mp_units::one / R};
+  return quantity{v / q.numerical_value_ref_in(get_unit(R)), delta<::mp_units::one / R>};
 }
 
 template<auto R1, typename Rep1, auto R2, typename Rep2>
diff --git a/src/core/include/mp-units/framework/quantity_cast.h b/src/core/include/mp-units/framework/quantity_cast.h
index 53b14815..b1e4e6fc 100644
--- a/src/core/include/mp-units/framework/quantity_cast.h
+++ b/src/core/include/mp-units/framework/quantity_cast.h
@@ -57,7 +57,7 @@ template<QuantitySpec auto ToQS, typename Q>
 [[nodiscard]] constexpr Quantity auto quantity_cast(Q&& q)
 {
   return quantity{std::forward<Q>(q).numerical_value_is_an_implementation_detail_,
-                  make_reference(ToQS, std::remove_reference_t<Q>::unit)};
+                  delta<make_reference(ToQS, std::remove_reference_t<Q>::unit)>};
 }
 
 /**
diff --git a/src/core/include/mp-units/framework/quantity_spec.h b/src/core/include/mp-units/framework/quantity_spec.h
index 855dd25c..9b4a3131 100644
--- a/src/core/include/mp-units/framework/quantity_spec.h
+++ b/src/core/include/mp-units/framework/quantity_spec.h
@@ -129,7 +129,7 @@ struct quantity_spec_interface {
              (explicitly_convertible(std::remove_reference_t<Q>::quantity_spec, self))
   {
     return quantity{std::forward<Q>(q).numerical_value_is_an_implementation_detail_,
-                    detail::make_reference(self, std::remove_cvref_t<Q>::unit)};
+                    delta<detail::make_reference(self, std::remove_cvref_t<Q>::unit)>};
   }
 #else
   template<typename Self_ = Self, UnitOf<Self_{}> U>
@@ -144,7 +144,7 @@ struct quantity_spec_interface {
   [[nodiscard]] constexpr Quantity auto operator()(Q&& q) const
   {
     return quantity{std::forward<Q>(q).numerical_value_is_an_implementation_detail_,
-                    detail::make_reference(Self{}, std::remove_cvref_t<Q>::unit)};
+                    delta<detail::make_reference(Self{}, std::remove_cvref_t<Q>::unit)>};
   }
 #endif
 };
@@ -341,7 +341,7 @@ struct quantity_spec<Self, QS, Args...> : detail::propagate_equation<QS>, detail
   [[nodiscard]] constexpr Quantity auto operator()(Q&& q) const
   {
     return quantity{std::forward<Q>(q).numerical_value_is_an_implementation_detail_,
-                    detail::make_reference(Self{}, std::remove_cvref_t<Q>::unit)};
+                    delta<detail::make_reference(Self{}, std::remove_cvref_t<Q>::unit)>};
   }
 #endif
 };
diff --git a/src/core/include/mp-units/framework/reference.h b/src/core/include/mp-units/framework/reference.h
index 746abb44..d5b980d7 100644
--- a/src/core/include/mp-units/framework/reference.h
+++ b/src/core/include/mp-units/framework/reference.h
@@ -26,6 +26,7 @@
 #include <mp-units/bits/get_associated_quantity.h>
 #include <mp-units/bits/module_macros.h>
 #include <mp-units/framework/quantity_concepts.h>
+#include <mp-units/framework/quantity_point_concepts.h>
 #include <mp-units/framework/reference_concepts.h>
 #include <mp-units/framework/representation_concepts.h>
 
@@ -40,8 +41,18 @@ namespace detail {
 template<QuantitySpec auto Q, Unit auto U>
 using reference_t = reference<MP_UNITS_REMOVE_CONST(decltype(Q)), MP_UNITS_REMOVE_CONST(decltype(U))>;
 
+template<typename R>
+  requires DeltaReference<R> || AbsoluteReference<R>
+[[nodiscard]] consteval Reference auto get_original_reference(R r)
+{
+  if constexpr (requires { R::_original_reference_; })
+    return R::_original_reference_;
+  else
+    return r;
 }
 
+}  // namespace detail
+
 MP_UNITS_EXPORT_BEGIN
 
 [[nodiscard]] consteval QuantitySpec auto get_quantity_spec(AssociatedUnit auto u)
@@ -173,18 +184,39 @@ struct reference {
 };
 
 
-template<typename Rep, Reference R>
-  requires RepresentationOf<std::remove_cvref_t<Rep>, get_quantity_spec(R{}).character>
-[[nodiscard]] constexpr quantity<R{}, std::remove_cvref_t<Rep>> operator*(Rep&& lhs, R)
+template<typename Rep, DeltaReference R>
+  requires RepresentationOf<std::remove_cvref_t<Rep>, get_quantity_spec(detail::get_original_reference(R{})).character>
+[[nodiscard]] constexpr quantity<detail::get_original_reference(R{}), std::remove_cvref_t<Rep>> operator*(Rep&& lhs, R)
 {
   return quantity{std::forward<Rep>(lhs), R{}};
 }
 
-template<typename Rep, Reference R>
-  requires RepresentationOf<std::remove_cvref_t<Rep>, get_quantity_spec(R{}).character>
-[[nodiscard]] constexpr quantity<inverse(R{}), std::remove_cvref_t<Rep>> operator/(Rep&& lhs, R)
+template<typename Rep, DeltaReference R>
+  requires RepresentationOf<std::remove_cvref_t<Rep>, get_quantity_spec(detail::get_original_reference(R{})).character>
+[[nodiscard]] constexpr quantity<inverse(detail::get_original_reference(R{})), std::remove_cvref_t<Rep>> operator/(
+  Rep&& lhs, R)
 {
-  return quantity{std::forward<Rep>(lhs), inverse(R{})};
+  return quantity{std::forward<Rep>(lhs), delta<inverse(detail::get_original_reference(R{}))>};
+}
+
+template<typename Rep, AbsoluteReference R>
+  requires RepresentationOf<std::remove_cvref_t<Rep>, get_quantity_spec(detail::get_original_reference(R{})).character>
+[[nodiscard]] constexpr quantity_point<detail::get_original_reference(R{}),
+                                       default_point_origin(detail::get_original_reference(R{})),
+                                       std::remove_cvref_t<Rep>>
+operator*(Rep&& lhs, R)
+{
+  return quantity_point{std::forward<Rep>(lhs) * delta<detail::get_original_reference(R{})>};
+}
+
+template<typename Rep, AbsoluteReference R>
+  requires RepresentationOf<std::remove_cvref_t<Rep>, get_quantity_spec(detail::get_original_reference(R{})).character>
+[[nodiscard]] constexpr quantity_point<inverse(detail::get_original_reference(R{})),
+                                       default_point_origin(detail::get_original_reference(R{})),
+                                       std::remove_cvref_t<Rep>>
+operator/(Rep&& lhs, R)
+{
+  return quantity_point{std::forward<Rep>(lhs) * delta<inverse(detail::get_original_reference(R{}))>};
 }
 
 template<Reference R, typename Rep>
@@ -202,7 +234,7 @@ template<typename Q, Reference R>
 [[nodiscard]] constexpr Quantity auto operator*(Q&& q, R)
 {
   return quantity{std::forward<Q>(q).numerical_value_is_an_implementation_detail_,
-                  std::remove_cvref_t<Q>::reference * R{}};
+                  delta<std::remove_cvref_t<Q>::reference * R{}>};
 }
 
 template<typename Q, Reference R>
@@ -210,7 +242,7 @@ template<typename Q, Reference R>
 [[nodiscard]] constexpr Quantity auto operator/(Q&& q, R)
 {
   return quantity{std::forward<Q>(q).numerical_value_is_an_implementation_detail_,
-                  std::remove_cvref_t<Q>::reference / R{}};
+                  delta<std::remove_cvref_t<Q>::reference / R{}>};
 }
 
 template<Reference R, typename Q>
diff --git a/src/core/include/mp-units/framework/reference_concepts.h b/src/core/include/mp-units/framework/reference_concepts.h
index a2c78365..0bd2a49d 100644
--- a/src/core/include/mp-units/framework/reference_concepts.h
+++ b/src/core/include/mp-units/framework/reference_concepts.h
@@ -80,4 +80,32 @@ concept ReferenceOf = Reference<T> && QuantitySpecOf<decltype(get_quantity_spec(
 
 MP_UNITS_EXPORT_END
 
+// reference specifiers
+template<Reference R>
+struct relative_ final {
+  static constexpr Reference auto _original_reference_ = R{};
+};
+
+template<Reference R>
+struct absolute_ final {
+  static constexpr Reference auto _original_reference_ = R{};
+};
+
+MP_UNITS_EXPORT_BEGIN
+
+template<Reference auto R>
+inline constexpr relative_<MP_UNITS_REMOVE_CONST(decltype(R))> delta{};
+
+template<Reference auto R>
+inline constexpr absolute_<MP_UNITS_REMOVE_CONST(decltype(R))> absolute{};
+
+template<typename T>
+concept DeltaReference =
+  (Reference<T> && !requires { get_unit(T{}).point_origin; }) || is_specialization_of<T, relative_>;
+
+template<typename T>
+concept AbsoluteReference = is_specialization_of<T, absolute_>;
+
+MP_UNITS_EXPORT_END
+
 }  // namespace mp_units
diff --git a/src/core/include/mp-units/math.h b/src/core/include/mp-units/math.h
index 50dd222a..96fb2ffa 100644
--- a/src/core/include/mp-units/math.h
+++ b/src/core/include/mp-units/math.h
@@ -115,7 +115,7 @@ template<ReferenceOf<dimensionless> auto R, typename Rep>
 {
   using std::exp;
   return value_cast<get_unit(R)>(
-    quantity{static_cast<Rep>(exp(q.force_numerical_value_in(q.unit))), detail::clone_reference_with<one>(R)});
+    quantity{static_cast<Rep>(exp(q.force_numerical_value_in(q.unit))), delta<detail::clone_reference_with<one>(R)>});
 }
 
 /**
@@ -236,7 +236,7 @@ template<auto R, auto S, auto T, typename Rep1, typename Rep2, typename Rep3>
   using std::fma;
   return quantity{
     fma(a.numerical_value_ref_in(a.unit), x.numerical_value_ref_in(x.unit), b.numerical_value_ref_in(b.unit)),
-    common_reference(R * S, T)};
+    delta<common_reference(R * S, T)>};
 }
 
 /**
@@ -260,7 +260,7 @@ template<auto R, auto S, auto T, auto Origin, typename Rep1, typename Rep2, type
   using std::fma;
   return Origin + quantity{fma(a.numerical_value_ref_in(a.unit), x.numerical_value_ref_in(x.unit),
                                b.quantity_ref_from(b.point_origin).numerical_value_ref_in(b.unit)),
-                           common_reference(R * S, T)};
+                           delta<common_reference(R * S, T)>};
 }
 
 /**
@@ -277,7 +277,7 @@ template<auto R1, typename Rep1, auto R2, typename Rep2>
   constexpr auto ref = common_reference(R1, R2);
   constexpr auto unit = get_unit(ref);
   using std::fmod;
-  return quantity{fmod(x.numerical_value_in(unit), y.numerical_value_in(unit)), ref};
+  return quantity{fmod(x.numerical_value_in(unit), y.numerical_value_in(unit)), delta<ref>};
 }
 
 /**
@@ -294,7 +294,7 @@ template<auto R1, typename Rep1, auto R2, typename Rep2>
   constexpr auto ref = common_reference(R1, R2);
   constexpr auto unit = get_unit(ref);
   using std::remainder;
-  return quantity{remainder(x.numerical_value_in(unit), y.numerical_value_in(unit)), ref};
+  return quantity{remainder(x.numerical_value_in(unit), y.numerical_value_in(unit)), delta<ref>};
 }
 
 
@@ -339,7 +339,7 @@ template<Unit auto To, auto R, typename Rep>
       return {static_cast<Rep>(floor(q.numerical_value_ref_in(q.unit))), detail::clone_reference_with<To>(R)};
     } else {
       return handle_signed_results(
-        quantity{static_cast<Rep>(floor(q.force_numerical_value_in(To))), detail::clone_reference_with<To>(R)});
+        quantity{static_cast<Rep>(floor(q.force_numerical_value_in(To))), delta<detail::clone_reference_with<To>(R)>});
     }
   } else {
     if constexpr (To == get_unit(R)) {
@@ -376,7 +376,7 @@ template<Unit auto To, auto R, typename Rep>
       return {static_cast<Rep>(ceil(q.numerical_value_ref_in(q.unit))), detail::clone_reference_with<To>(R)};
     } else {
       return handle_signed_results(
-        quantity{static_cast<Rep>(ceil(q.force_numerical_value_in(To))), detail::clone_reference_with<To>(R)});
+        quantity{static_cast<Rep>(ceil(q.force_numerical_value_in(To))), delta<detail::clone_reference_with<To>(R)>});
     }
   } else {
     if constexpr (To == get_unit(R)) {
@@ -456,7 +456,7 @@ template<auto R1, typename Rep1, auto R2, typename Rep2>
   constexpr auto ref = common_reference(R1, R2);
   constexpr auto unit = get_unit(ref);
   using std::hypot;
-  return quantity{hypot(x.numerical_value_in(unit), y.numerical_value_in(unit)), ref};
+  return quantity{hypot(x.numerical_value_in(unit), y.numerical_value_in(unit)), delta<ref>};
 }
 
 /**
@@ -474,7 +474,8 @@ template<auto R1, typename Rep1, auto R2, typename Rep2, auto R3, typename Rep3>
   constexpr auto ref = common_reference(R1, R2);
   constexpr auto unit = get_unit(ref);
   using std::hypot;
-  return quantity{hypot(x.numerical_value_in(unit), y.numerical_value_in(unit), z.numerical_value_in(unit)), ref};
+  return quantity{hypot(x.numerical_value_in(unit), y.numerical_value_in(unit), z.numerical_value_in(unit)),
+                  delta<ref>};
 }
 
 }  // namespace mp_units
diff --git a/src/systems/include/mp-units/systems/si/units.h b/src/systems/include/mp-units/systems/si/units.h
index bbcf0166..cb5371a6 100644
--- a/src/systems/include/mp-units/systems/si/units.h
+++ b/src/systems/include/mp-units/systems/si/units.h
@@ -77,7 +77,7 @@ inline constexpr struct weber final : named_unit<"Wb", volt * second> {} weber;
 inline constexpr struct tesla final : named_unit<"T", weber / square(metre)> {} tesla;
 inline constexpr struct henry final : named_unit<"H", weber / ampere> {} henry;
 
-inline constexpr struct ice_point final : relative_point_origin<quantity_point{273'150 * milli<kelvin>}> {} ice_point;
+inline constexpr struct ice_point final : relative_point_origin<273'150 * absolute<milli<kelvin>>> {} ice_point;
 inline constexpr auto zeroth_degree_Celsius = ice_point;
 inline constexpr struct degree_Celsius final : named_unit<symbol_text{u8"°C", "`C"}, kelvin, zeroth_degree_Celsius> {} degree_Celsius;
 
diff --git a/src/systems/include/mp-units/systems/usc.h b/src/systems/include/mp-units/systems/usc.h
index 3cde7c36..6192d63b 100644
--- a/src/systems/include/mp-units/systems/usc.h
+++ b/src/systems/include/mp-units/systems/usc.h
@@ -118,7 +118,7 @@ inline constexpr struct troy_pound final : named_unit<"lb t", mag<12> * troy_onc
 inline constexpr struct inch_of_mercury final : named_unit<"inHg", mag_ratio<3'386'389, 1'000> * si::pascal> {} inch_of_mercury;
 
 // https://en.wikipedia.org/wiki/United_States_customary_units#Temperature
-inline constexpr struct zeroth_degree_Fahrenheit final : relative_point_origin<quantity_point{-32 * (mag_ratio<5, 9> * si::degree_Celsius)}> {} zeroth_degree_Fahrenheit;
+inline constexpr struct zeroth_degree_Fahrenheit final : relative_point_origin<-32 * absolute<mag_ratio<5, 9> * si::degree_Celsius>> {} zeroth_degree_Fahrenheit;
 inline constexpr struct degree_Fahrenheit final : named_unit<symbol_text{u8"°F", "`F"}, mag_ratio<5, 9> * si::degree_Celsius, zeroth_degree_Fahrenheit> {} degree_Fahrenheit;
 
 // clang-format on
diff --git a/test/static/quantity_point_test.cpp b/test/static/quantity_point_test.cpp
index a335ccac..b3ff307f 100644
--- a/test/static/quantity_point_test.cpp
+++ b/test/static/quantity_point_test.cpp
@@ -801,9 +801,12 @@ static_assert(
 //////////////////////////////////
 
 static_assert(quantity_point{42 * m}.quantity_from_zero() == 42 * m);
+static_assert((42 * absolute<m>).quantity_from_zero() == 42 * m);
 static_assert(quantity_point{isq::height(42 * m)}.quantity_from_zero() == 42 * m);
-static_assert(quantity_point{20 * deg_C}.quantity_from_zero() == 20 * deg_C);
-static_assert(quantity_point{20. * deg_C}.in(deg_F).quantity_from_zero() == 68 * deg_F);
+static_assert(quantity_point{20 * delta<deg_C>}.quantity_from_zero() == 20 * delta<deg_C>);
+static_assert((20 * absolute<deg_C>).quantity_from_zero() == 20 * delta<deg_C>);
+static_assert(quantity_point{20. * delta<deg_C>}.in(deg_F).quantity_from_zero() == 68 * delta<deg_F>);
+static_assert((20. * absolute<deg_C>).in(deg_F).quantity_from_zero() == 68 * delta<deg_F>);
 
 static_assert((mean_sea_level + 42 * m).quantity_from_zero() == 42 * m);
 static_assert((ground_level + 42 * m).quantity_from_zero() == 84 * m);
@@ -889,13 +892,12 @@ static_assert(std::is_same_v<std::remove_const_t<decltype(quantity_point{isq::he
 static_assert(quantity_point{isq::height(123 * m)}.unit == si::metre);
 static_assert(quantity_point{isq::height(123 * m)}.quantity_spec == isq::height);
 
-static_assert(std::is_same_v<decltype(quantity_point{20 * deg_C})::rep, int>);
-static_assert(
-  std::is_same_v<std::remove_const_t<decltype(quantity_point{20 * deg_C}.point_origin)>, struct si::ice_point>);
-static_assert(std::is_same_v<std::remove_const_t<decltype(quantity_point{20 * deg_C}.absolute_point_origin)>,
+static_assert(std::is_same_v<decltype(20 * absolute<deg_C>)::rep, int>);
+static_assert(std::is_same_v<std::remove_const_t<decltype((20 * absolute<deg_C>).point_origin)>, struct si::ice_point>);
+static_assert(std::is_same_v<std::remove_const_t<decltype((20 * absolute<deg_C>).absolute_point_origin)>,
                              struct si::absolute_zero>);
-static_assert(quantity_point{20 * deg_C}.unit == si::degree_Celsius);
-static_assert(quantity_point{20 * deg_C}.quantity_spec == kind_of<isq::thermodynamic_temperature>);
+static_assert((20 * absolute<deg_C>).unit == si::degree_Celsius);
+static_assert((20 * absolute<deg_C>).quantity_spec == kind_of<isq::thermodynamic_temperature>);
 
 #if MP_UNITS_HOSTED
 using namespace std::chrono_literals;
diff --git a/test/static/usc_test.cpp b/test/static/usc_test.cpp
index 099a710f..a91f5a10 100644
--- a/test/static/usc_test.cpp
+++ b/test/static/usc_test.cpp
@@ -126,6 +126,7 @@ static_assert(isq::mass(1 * lb_t) == isq::mass(12 * oz_t));
 static_assert(isq::pressure(1'000 * inHg) == isq::pressure(3'386'389 * si::pascal));
 
 // Temperature
-static_assert(isq::thermodynamic_temperature(9 * deg_F) == isq::thermodynamic_temperature(5 * si::degree_Celsius));
+static_assert(isq::thermodynamic_temperature(9 * delta<deg_F>) ==
+              isq::thermodynamic_temperature(5 * delta<si::degree_Celsius>));
 
 }  // namespace