Function raFK4toFK5radians( raFK4, decFK4 )

Description:
Converts a B1950.0 FK4 position to J2000.0 FK5 at an epoch of B1950.0 yielding Right Ascension. This assumes zero proper motion in the FK5 frame.
Parameters:
raFK4 (floating point)
right ascension in B1950.0 FK4 system (radians)
decFK4 (floating point)
declination in B1950.0 FK4 system (radians)
Return Value (floating point):
right ascension in J2000.0 FK5 system (radians)
Signature:
double raFK4toFK5radians(double, double)