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15-inch reflector telescope, 1887

15-inch reflector telescope, 1887

C025/0124

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Credit

ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY

Caption

November 1887. This telescope is on an altazimuth mount. An altazimuth is used to measure the altitude (from the horizon) and azimuth (angle from north) of a star. These measurements can then be used to calculate the precise position of the star. Unlike a transit circle telescope, an altazimuth telescope can be pointed at any region of the sky, using a complicated mechanism to move the telescope. This telescope, at Oakfield, Bittern, near Southampton, UK, was operated by British astronomer Major T. A. Skelton (left).

Release details

Model release not available. Property release not required.

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