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Star trails around north celestial pole - Annapurna
auteur: Jia Hao/Novapix
référence: a-pas01-00124
Image Size 300 DPI: 25 * 15 cm
Startrail taken from Ghandruk, Nepal on Nov. 09, 2009.
Star trails are made by the combination of: the spinning of the Earth, the use of a stationary mount or tripod and a long exposure of the film. As the Earth spins, the stars begin to make concentric circles on the photograph. The closer stars are to Polaris, our North pole star, the smaller their circles. Thar farther away they are, the larger their circles.
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