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due earth exposure exposures have hours image individual locations long longer major measure minutes motion night nnstar normal observing open period photo photograph photography professional quality range requiring resulting rotation setting several shows shutter sky star stars startrail streaks telescopes than times trailStartrails Editorial Photo
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Startrails #51483663
Description
A star trail is a type of photograph that utilizes long-exposure times to capture the apparent motion of stars in the night sky due to the rotation of the Earth. A star trail photograph shows individual stars as streaks across the image, with longer exposures resulting in longer streaks. Typical exposure times for a star trail range from 15 minutes to several hours, requiring a 'bulb' setting on the camera to open the shutter for a longer period than is normal. Star trails have been used by professional astronomers to measure the quality of observing locations for major telescopes.
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