Apply corrections for proper motion to a star RA,Dec. (double precision)
1984 Astronomical Almanac, pp b39-b41. (also Lederle & Schwan, Astron. Astrophys. 134, 1-6, 1984)
r0,d0 double RA,Dec at epoch ep0 (rad) pr,pd double proper motions: RA,Dec changes per year of epoch px double parallax (arcsec) rv double radial velocity (km/sec, +ve if receding) ep0 double start epoch in years (e.g Julian epoch) ep1 double end epoch in years (same system as ep0)
*r1,*d1 double RA,Dec at epoch ep1 (rad) Note: The proper motions in RA are dRA/dt rather than cos(dec)*dra/dt, and are in the same coordinate system as r0,d0.
slaDcs2c, slaDcc2s, slaDranrm Defined in slamac.h: DAS2R P.T.Wallace Starlink 31 October 1993