Convert from alt,azi,time to ra,dec.
altazi2radec, alt, azi, js_ut, lng, lat, ra, dec
alt, azi = Object altitude and azimuth in deg. in
js_ut = UT Time in JS. in
lng, lat = Observer long,lat in deg. in
ra,dec = R.A., Dec in deg. out
R. Sterner, 2001 Jan 11
Copyright (C) 2001, Johns Hopkins University/Applied Physics Laboratory
This software may be used, copied, or redistributed as long as it is not
sold and this copyright notice is reproduced on each copy made. This
routine is provided as is without any express or implied warranties
whatsoever. Other limitations apply as described in the file disclaimer.txt.