[AZ-Observing] Green Flash of Venus and Sirius

  • From: Tom Polakis <tpolakis@xxxxxxx>
  • To: AZ-Observing@xxxxxxxxxxxxx
  • Date: Sun, 18 Jan 2015 20:08:08 -0500

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.


The photos were taken from the Antennas site.  Both objects set over the Kofa 
range, about 15 miles away.

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