2026-01-16 18:00:09 +01:00
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<!-- This file is auto-generated. Do not edit manually. -->
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<!-- Run: python3 scripts/systems_reference.py --force -->
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# Astronomy System
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**Namespace:** `mp_units::astronomy`
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**Module:** `mp_units.systems`
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**Header:** `<mp-units/systems/astronomy.h>`
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## Units
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| Unit Name | Symbol | unit_symbol | Definition |
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|-----------|:------:|:-----------:|------------|
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| <span id="Julian_year"></span><code>Julian_<wbr>year</code> | a | `a` | <code>mag_ratio<365'25, 100> * <wbr>[day](#day)</code> |
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| <span id="century"></span><code>century</code> | c | `c` | <code>mag<100> * <wbr>[Julian_<wbr>year](#Julian_year)</code> |
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2026-01-18 12:40:28 +01:00
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| <span id="day"></span><code>day</code> | D | `D` | <code>[non_<wbr>si::day](si.md#day)</code> |
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2026-01-18 16:44:46 +01:00
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| <span id="gaussian_gravitational_constant"></span><code>gaussian_<wbr>gravitational_<wbr>constant</code> | k | `k` | <code>mag_ratio<1'720'209'895, 100'000'000'000> * <wbr>pow<3, 2>([iau::astronomical_<wbr>unit](si.md#astronomical_unit)) / <wbr>pow<1,2>([iau::solar_<wbr>mass](iau.md#codata2018-solar_mass)) / <wbr>[day](#day)</code> |
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2026-01-17 17:20:09 +01:00
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| <span id="jansky"></span><code>jansky</code> | Jy | `Jy` | <code>mag_power<10, -26> * <wbr>[si::watt](si.md#watt) / <wbr>square([si::metre](si.md#metre)) / <wbr>[si::hertz](si.md#hertz)</code> |
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| <span id="light_year"></span><code>light_<wbr>year</code> | ly | `ly` | <code>mag<9'460'730'472'580'800> * <wbr>[si::metre](si.md#metre)</code> |
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| <span id="lunar_distance"></span><code>lunar_<wbr>distance</code> | LD | `LD` | <code>mag<384'399> * <wbr>[si::kilo](si.md#kilo)<[si::metre](si.md#metre)></code> |
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| <span id="millennium"></span><code>millennium</code> | ka | `ka` | <code>mag<1000> * <wbr>[Julian_<wbr>year](#Julian_year)</code> |
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| <span id="sidereal_day"></span><code>sidereal_<wbr>day</code> | D_sid | `D_sid` | <code>mag_ratio<86'164'0905, 1'000'000> * <wbr>[si::second](si.md#second)</code> |
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| <span id="tropical_year"></span><code>tropical_<wbr>year</code> | a_trop | `a_trop` | <code>mag_ratio<365'242189, 1'000'000> * <wbr>[day](#day)</code> |
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