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split off astronomical constants from units #1059

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split off astronomical constants from units #1059

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54e26e9
split off astronomical constants from units
rieder Jun 14, 2024
3f661af
Lightyear is a physical constant (julianyr * lightspeed), not astrono…
rieder Jul 8, 2024
e8563b8
sanitize test_pickle, *don't* import * from modules! causes clashes b…
rieder Jul 8, 2024
3465180
I know, importing *... but here no better way to do it.
rieder Jul 8, 2024
a95b3e5
rewrite/modernise nist.py.
rieder Jul 8, 2024
9d20f4f
small updates
rieder Jul 8, 2024
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19 changes: 19 additions & 0 deletions src/amuse/units/astronomical_constants.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,19 @@
"""
Series of astronomical constants, which are in turn used by the units of the
same names.
"""

import numpy as np
from amuse.units.si import m, kg
from amuse.units.derivedsi import W, km

au = 149597870691.0 | m
parsec = au / np.tan(np.pi / (180 * 60 * 60))
lightyear = 9460730472580.8 | km
Lsun = 3.839e26 | W
Msun = 1.98892e30 | kg
Rsun = 6.955e8 | m
Mjupiter = 1.8987e27 | kg
Rjupiter = 71492.0 | km
Mearth = 5.9722e24 | kg
Rearth = 6371.0088 | km # IUGG mean radius
23 changes: 12 additions & 11 deletions src/amuse/units/units.py
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Expand Up @@ -4,6 +4,7 @@

import numpy
from . import constants
from . import astronomical_constants
from . import quantities

# The two imports below are to explicitly expose everything directly used in
Expand Down Expand Up @@ -43,20 +44,20 @@

# astronomical units
angstrom = named("angstrom", "angstrom", 1e-10 * m)
au = named("astronomical unit", "au", 149597870691.0 * m)
aud = named("au per day", "aud", 149597870691.0 * m / day)
parsec = named("parsec", "parsec", au / numpy.tan(numpy.pi / (180 * 60 * 60)))
au = named("astronomical unit", "au", astronomical_constants.au.as_unit())
aud = named("au per day", "aud", astronomical_constants.au.as_unit() / day)
parsec = named("parsec", "parsec", astronomical_constants.parsec.as_unit())
kpc = named("kilo parsec", "kpc", 10**3 * parsec)
Mpc = named("mega parsec", "Mpc", 10**6 * parsec)
Gpc = named("giga parsec", "Gpc", 10**9 * parsec)
lightyear = named("light year", "ly", 9460730472580.8 * km)
LSun = named("solar luminosity", "LSun", 3.839e26 * W)
MSun = named("solar mass", "MSun", 1.98892e30 * kg)
RSun = named("solar radius", "RSun", 6.955e8 * m)
MJupiter = named("jupiter mass", "MJupiter", 1.8987e27 * kg)
RJupiter = named("jupiter radius", "RJupiter", 71492.0 * km)
MEarth = named("earth mass", "MEarth", 5.9722e24 * kg)
REarth = named("earth radius", "REarth", 6371.0088 * km) # IUGG mean radius
lightyear = named("light year", "ly", astronomical_constants.lightyear.as_unit())
LSun = named("solar luminosity", "LSun", astronomical_constants.Lsun.as_unit())
MSun = named("solar mass", "MSun", astronomical_constants.Msun.as_unit())
RSun = named("solar radius", "RSun", astronomical_constants.Rsun.as_unit())
MJupiter = named("jupiter mass", "MJupiter", astronomical_constants.Mjupiter.as_unit())
RJupiter = named("jupiter radius", "RJupiter", astronomical_constants.Rjupiter.as_unit())
MEarth = named("earth mass", "MEarth", astronomical_constants.Mearth.as_unit())
REarth = named("earth radius", "REarth", astronomical_constants.Rearth.as_unit())
kyr = named("kilo year", "kyr", 1000 * yr)
myr = named("million year", "Myr", 1000000 * yr)
gyr = named("giga (billion) year", "Gyr", 1000000000 * yr)
Expand Down