Test the gnomonic (TAN-) projection code used in my OTW routines that was developed in Summer 2014. The (OTW) code that performs the projection is cdfp_proj and just for completeness, I show an interactive run of it below. I used test_proj to perform gnomonic projection tests around the sky and confirm that various quadrants do not suffer from angle definition errors (i.e. that I use the tan2 function properly).
test_proj 12:33:32.21 +41:24:15.4 15.0 arg1 - RA center (deg) arg2 - DEC center (deg) arg3 - field radius (arcmin) A call to the actual projection job would be: cdfp_proj.sh usno_all.cdfp 12.39777 -10.37737 1.35 > cdfp_proj.cdfpIt should be noted that this routine gathers a test cdfp catalog with the skygrab script and uses various coordinate formatting tasks like psex.py.