Precession Routine

This routine will precess astronomical coordinates from one epoch to another.

Right Ascension (format HHMMSS.SS):
Declination (format -DDMMSS.S):
Initial epoch (format Eyyyy.yy):
Final epoch (format Eyyyy.yy):
RA proper motion ("/yr) (format spp.ppp):
DEC proper motion ("/yr) (format spp.ppp):
Parallax (") (format pp.ppp):
Radial velocity (format sppp.pp):


This page makes use of some of the Starlink Project's SLALIB astronomical subroutines written by P. T. Wallace. The accuracy is about 0.1 arcseconds. The B in the epoch field refers to the FK4 system, J refers to the FK5.


emurphy@pha.jhu.edu