> is all that's required to convert altaz into R.A. and declination. This I assume everyone knows there are computer programs that will convert Azim/Elev to RA/DEC. Free programs. Nothing else is needed. -- Join us at Eurosom 2, the Satellite Observers Meeting: Oct.19/20, Belgium http://www.rzg.mpg.de/~bdp/eurosom.html -- JRespler@InJersey.com or Jay.Respler@bytewise.org Satellite Tracker * Early Typewriter Collector Freehold, New Jersey