Interesting to note that the curve truly flattens out at Astronomical twilight Clear Skies Rick Tejera President, Editor SACnews Saguaro Astronomy Club Phoenix, Arizona www.saguaroastro.org saguaroastro@xxxxxxx -----Original Message----- From: az-observing-bounce@xxxxxxxxxxxxx [mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Tom Polakis Sent: Tuesday, December 04, 2007 23:19 To: amastro@xxxxxxxxxxxxxxx Cc: AZ-Observing@xxxxxxxxxxxxx Subject: [AZ-Observing] Re: [amastro] Another twilight SQM series I felt compelled to plot Brian's data. http://members.cox.net/tpolakis/astro/SQMsunset1.jpg http://members.cox.net/tpolakis/astro/SQMsunset2.jpg In the latter plot, I have run the desktop planetarium software to compute the solar depression angles. Tom -- 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.