Calculates a rotation matrix from J2000 mean equator (EQJ) to galactic (GAL).
This is one of the family of functions that returns a rotation matrix
for converting from one orientation to another.
Source: EQJ = equatorial system, using the equator at the J2000 epoch.
Target: GAL = galactic system (IAU 1958 definition).
Calculates a rotation matrix from J2000 mean equator (EQJ) to galactic (GAL).
This is one of the family of functions that returns a rotation matrix for converting from one orientation to another. Source: EQJ = equatorial system, using the equator at the J2000 epoch. Target: GAL = galactic system (IAU 1958 definition).