skycoor
Examples

1. Print B1950 coordinates for two J2000 positions: skycoor -v 9:55:41.600 +69:00:27.99 J2000 9:54:53.258 +69:03:49.30 J2000; SKYCOOR 2.2 13 May 1998, Doug Mink, SAO; 9:55:41.600 +69:00:27.99 J2000 -> 09:51:36.102 +69:14:41.51 B1950; 9:54:53.258 +69:03:49.30 J2000 -> 09:50:46.961 +69:18:00.96 B1950
2. Print J2000 coordinates in degrees for two B1950 positions: skycoor 09:51:36.102 +69:14:41.51 B1950 09:50:46.961 +69:18:00.96 B1950; 148.92329 69.00783 J2000; 148.72186 69.06375 J2000
3. Print Galactic coordinates to 6 decimal places instead of the default 5 for two J2000 positions: skycoor -g -n 6 9:55:41.600 +69:00:27.99 J2000 9:54:53.258 +69:03:49.30 J2000; 142.144474 40.943450 galactic; 142.138707 40.852337 galactic
4. Print J2000 coordinates For two galactic positions: skycoor -j 142.144474 40.943450 galactic 142.138707 40.852337 galactic; 09:55:41.600 +69:00:27.99 J2000; 09:54:53.258 +69:03:49.30 J2000
5. Find distance in arcseconds between two sky positions: skycoor -vr 9:55:41.600 +69:00:27.99 9:54:53.258 +69:03:49.30; SKYCOOR 3.5, 22 August 2003, Doug Mink (dmink@cfa.harvard.edu); ra1, dec1: 09:55:41.600 +69:00:27.99; ra2, dec2: 09:54:53.258 +69:03:49.30; Distance is 328.383 arcsec; dRA = -259.44108 arcsec, dDec = 201.31000 arcsec; skycoor -r 9:55:41.600 +69:00:27.99 9:54:53.258 +69:03:49.30; 328.383