galpy.util
galpy.util.conversion.mass_in_1010msol
galpy.util.conversion.velocity_in_kpcGyr
galpy.util.conversion.
time_in_Gyr
NAME:
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)