Michael, wow there is a lot of stuff in these two URL's. I'll check them out for precession information as time permits. Thanks. AJ Crayon Phoenix, AZ ----- Original Message ----- From: "Michael Collins" <cal_donley@xxxxxxx> To: <az-observing@xxxxxxxxxxxxx> Sent: Saturday, May 22, 2010 12:23 PM Subject: [AZ-Observing] Re: Rigorous Precession 1. <http://97.74.56.125/free/xephem-3.7.4.tar.gz> 2. <http://star-www.rl.ac.uk/star/docs/sun67.htx/sun67.html> -- cal_donley@xxxxxxx -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list. -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.