Hi Tom- Very nice! I tried something similar to our Kitt Peak sunset alignment, noting that the declination of Venus and the sun were similar at Christmas. You might not have seen my blog post, but shows Venus setting over the Observatory at 10 second intervals. Unfortunately, I chose to expose long enough to show dome details, so the colors are mostly lost in the quarter-second exposure w/the TEC 140. Next time I'll try a setup with shorter exposures: http://www.theketelsens.blogspot.com/2014/12/now-its-holiday.html -Dean ________________________________________ From: az-observing-bounce@xxxxxxxxxxxxx [az-observing-bounce@xxxxxxxxxxxxx] on behalf of Tom Polakis [tpolakis@xxxxxxx] Sent: Sunday, January 18, 2015 6:08 PM To: AZ-Observing@xxxxxxxxxxxxx Subject: [AZ-Observing] Green Flash of Venus and Sirius The "green flash" is a well-known atmospheric phenomenon in which the last setting rim of the sun appears green. It's explained well in a Wikipedia page. Here are a attempts to photograph green flashes of Venus and Sirius. The Venus green flash was obvious without binoculars, and much easier to see visually than in this sequence of the last 10 seconds before setting. The sequence of Sirius is less convincing, showing a "green rim" at the top in most frames. In order to show the color, exposures with a 200mm lens were very short: 1/60 second for Venus and 1/5 second for Sirius. http://www.pbase.com/polakis/image/158860744 http://www.pbase.com/polakis/image/158860745 The photos were taken from the Antennas site. Both objects set over the Kofa range, about 15 miles away. 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.