GEORGE EAST / SCIENCE PHOTO LIBRARY. GEORGE EAST / SCIENCE PHOTO LIBRARY.
Photograph (1-hour exposure time) showing circular star trails. The image was obtained by pointing the camera towards the pole star, Polaris, which is close to the Earth's axis of rotation; as a result, the Earth's circular motion is expressed by the circular motion of the stars around the North pole. Photographed from Mashpee, Massachusetts, USA, on August 8, 1975.
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