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