NAME:
galcencyl_to_vxvyvz
PURPOSE:
transform cylindrical Galactocentric coordinates to XYZ (wrt Sun) coordinates for velocities
INPUT:
vR - Galactocentric radial velocity
vT - Galactocentric tangential velocity
vZ - Galactocentric vertical velocity
phi - Galactocentric azimuth
vsun - velocity of the sun ndarray[3]
OUTPUT:
vx,vy,vz
HISTORY:
2011-02-24 - Written - Bovy (NYU)