ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY ROYAL ASTRONOMICAL SOCIETY / SCIENCE PHOTO LIBRARY
Altazimuth telescope at the Royal Observatory, Greenwich, London, England. This altazimuth telescope was constructed at Greenwich in the nineteenth century by the British astronomer George Biddell Airy (1801-1892). 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. Artwork published in the autobiography of the British astronomer Edwin Dunkin, who worked at Greenwich.
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