NAME:
cov_pmrapmdec_to_pmllpmbb
PURPOSE:
propagate the proper motions errors through the rotation from (ra,dec) to (l,b)
INPUT:
covar_pmradec - uncertainty covariance matrix of the proper motion in ra (multplied with cos(dec)) and dec [2,2] or [:,2,2]
ra - right ascension
dec - declination
degree - if True, ra and dec are given in degrees (default=False)
epoch - epoch of ra,dec (right now only 2000.0 and 1950.0 are supported)
OUTPUT:
covar_pmllbb [2,2] or [:,2,2]
HISTORY:
2010-04-12 - Written - Bovy (NYU)