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docs: point origins added to "Glossary"

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Mateusz Pusz
2023-06-22 20:25:25 +02:00
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docs/appendix/glossary.md
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@ -321,8 +321,24 @@
associated with a specific quantity ([quantity specification](#quantity_spec) and
[unit](#unit)).
[`absolute quantity point origin`, `absolute point origin`](#absolute-point-origin){ #absolute-point-origin }
: - An explicit point on an axis of values of a specific [quantity](#quantity) type that serves
as an absolute reference point for all [quantity points](#quantity-point) which definitions
are (explicitly or implicitly) based on it.
- For example, mean sea level is commonly used as an absolute reference point to measure altitudes.
[`quantity point origin`, `point origin`](#point-origin){ #point-origin }
: - An explicit point on an axis of values of a specific [quantity](#quantity) type serving as a reference
for other [quantities](#quantity).
- It might be ether an [absolute point origin](#absolute-point-origin) or a compile-time known
[quantity point](#quantity-point).
- For example, an ice point is a quantity point with a value of `273.15 K` that is used as
the zero point of a degree Celsius scale.
[`quantity point`, `absolute quantity`](#quantity-point){ #quantity-point }
: - An absolute [quantity](#quantity) with respect to an origin
: - An absolute [quantity](#quantity) with respect to an [origin](#point-origin).
- For example, timestamp (as opposed to duration), altitude (as opposed to height),
absolute temperature (as opposed to temperature difference).