From d5549ff92d4823d56d1d3b71216b943edaf303a0 Mon Sep 17 00:00:00 2001
From: Mateusz Pusz <mateusz.pusz@gmail.com>
Date: Wed, 18 Oct 2023 17:17:09 +0200
Subject: [PATCH] feat: `zero_Fahrenheit` point origin added

---
 src/systems/usc/include/mp-units/systems/usc/usc.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/systems/usc/include/mp-units/systems/usc/usc.h b/src/systems/usc/include/mp-units/systems/usc/usc.h
index 31d35c5b..bdfc0365 100644
--- a/src/systems/usc/include/mp-units/systems/usc/usc.h
+++ b/src/systems/usc/include/mp-units/systems/usc/usc.h
@@ -111,6 +111,8 @@ inline constexpr struct inch_of_mercury : named_unit<"inHg", mag<ratio(3'386'389
 
 // https://en.wikipedia.org/wiki/United_States_customary_units#Temperature
 inline constexpr struct degree_Fahrenheit : named_unit<basic_symbol_text{"°F", "`F"}, mag<ratio{5, 9}> * si::degree_Celsius> {} degree_Fahrenheit;
+
+inline constexpr struct zero_Fahrenheit : relative_point_origin<si::ice_point - 32 * degree_Fahrenheit> {} zero_Fahrenheit;
 // clang-format on
 
 namespace unit_symbols {