Circumpolar Star Trails

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Star trails photographs are created by pointing the camera, equipped with a standard lens, at the North Star and taking a long exposure. The rotation of the earth causes the star trails. This exposure was 7 hours long. The small thick arc in the center is the North Star. 10-minute sub-exposures were digitally combined. Star colors, normally hard to detect are made more visible in the trails

7 hour exposure, Canon 20D, 20mm f/1.8 lens @f/5.6 .
New Mexico Skies, Mayhill, New Mexico