NAME:
L
PURPOSE:
calculate the angular momentum at time t
INPUT:
t - (optional) time at which to get the angular momentum
ro= (Object-wide default) physical scale for distances to use to convert
vo= (Object-wide default) physical scale for velocities to use to convert
use_physical= use to override Object-wide default for using a physical scale for output
OUTPUT:
angular momentum
HISTORY:
2010-09-15 - Written - Bovy (NYU)
