Friday, September 16, 2011

APOD 1.3

A Summer Night's Dream (August 5, 2011)
This photo was taken by Mike Rosinski in Hartland, Michigan on a summer evening.  His intention was to photograph the star trails, which occur because of the Earth's rotation about its axis, for about 45 minutes to an hour.  He set his camera--on a tripod--on a long series of exposures in order to capture the stars' movement.  In other words, he took multiple pictures with his camera set on a slow shutter speed.  However, he fell asleep, and awakened 3 hours later... to his pleasant surprise, he was able to capture the star trails, the moon's reflection on a window, and the paths of fireflies!
I have always wanted to capture star trails, but was never sure how long to set the exposure; now I know!

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