galpy.util.bovy_conversion.mass_in_1010msol
galpy.util.bovy_coords
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NAME:
time_in_Gyr
PURPOSE:
convert a time to Gyr
INPUT:
vo - velocity unit in km/s ro - length unit in kpc
vo - velocity unit in km/s
ro - length unit in kpc
OUTPUT:
conversion from units where vo=1. at ro=1.
HISTORY:
2013-09-01 - Written - Bovy (IAS)