The precess program is given a right ascension and declination for the year 2000, and a year to precess these positions to, and it prints the precessed right ascension and declination.

I wrote the program.

The precess program is run like this:

Usage:  precess right_ascension declination year
        right_ascension and declination are in decimal hours and degrees, respectively
Note that you can't use minutes and seconds, just decimal hours and degrees.


        precess 3.789 -23.331 1492
and it tells you
R.A. =   3.424 hours  Dec = -24.984 degrees