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The Royal Observatory, Greenwich, London, 1914.

The Royal Observatory, Greenwich, London, 1914.
4 0 c m
actual image size: 21cm x 32cm


Photograph of the building that houses Christie's Altazimuth installed at the Royal Observatory, Greenwich in 1896. Designed by the Astronomer Royal, W H Christie (1845-1910) the instrument was used make observations anywhere in the sky. Unlike a transit instrument, which is limited to measuring an object's position in the north-south meridian, the altazimuth could make measurements in any direction. This was particularly important for monitoring the complex motion of the Moon and allowed observations to be made at every opportunity. Today the observatory now forms part of the National Maritime Museum. The dome for this instrument is now occupied with a telescope used for public viewing.

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© Science Museum / Science & Society Picture Library

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