Message posted by Bill T. on April 14, 2005 at 8:42:08 PST:
Hiyas. It looks like 10 dots in the picture, so if the strobe was flashing once every 2 seconds, that was a 20-second time exposure. You can also (just) notice that the stars are 'trailing', and during the time exposure the Earth has rotated a few degrees - You can see the stars arcing about a point (behind the pine tree). Anyone with a 20 or 30 second (or 'B') time-exposure setting on their camera can try a similar picture, better if the camera is static rather than hand-held... Astro-photo websites will have many examples. Cheers,
As suggested, the dots are strobing aircraft 'anti-collision' lights - the time-exposure photograph has captured each flash in turn...
With dark skies, the star's trails can look wonderful!
(The various star colours can also be seen, especially if the lens is carefully 'de-focussed' during the exposure!)
Bill T. (UK)
In Reply to: What is this in this picture? posted by Kris Hull on April 13, 2005 at 21:12:28 PST:
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