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Sun, Jul 13, 11:49

gunits
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#!/usr/bin/env python
kpc_in_cm = 3.0857e+21
year_in_s = 60*60*24*365 #365.25
Msol_in_g = 1.989e33
G_in_cgs = 6.672e-8 # 6.67428e-8
UnitLength_in_cm = 1 *kpc_in_cm
UnitTime_in_s = 1e6 *year_in_s
UnitVelocity_in_cm_per_s= UnitLength_in_cm/UnitTime_in_s
G = 1.0
UnitMass_in_g = (UnitLength_in_cm)**3/(UnitTime_in_s)**2 *G/ G_in_cgs
print "UnitLength_in_cm = %g"%(UnitLength_in_cm)
print "UnitLength_in_kpc = %g"%(UnitLength_in_cm/kpc_in_cm)
print
print "UnitTime_in_s = %g"%(UnitTime_in_s)
print "UnitTime_in_yr = %g"%(UnitTime_in_s/year_in_s)
print
print "UnitMass_in_g = %g"%(UnitMass_in_g)
print "UnitMass_in_Msol = %g"%(UnitMass_in_g/Msol_in_g)
print
print "UnitVelocity_in_cm_per_s = %g"%(UnitVelocity_in_cm_per_s)
print "UnitVelocity_in_km_per_s = %g"%(UnitVelocity_in_cm_per_s/1e5)
print "G (code unit) = %g"%(G_in_cgs/(UnitLength_in_cm)**3*(UnitTime_in_s)**2*UnitMass_in_g)

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