How to take Startrail Photographs

Startrail photographs are long exposure photographs which show the apparent movement of stars through the sky in a circular motion.These photographs can be taken to measure the rotation of the earth (or length of the sidereal day) or simply because they produce a very interesting and artistic image....
By: BenS5

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from Instructables: exploring - technology - robots http://ift.tt/1HOkCSE

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