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The Anglo-Australian Telescope

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The Anglo-Australian Telescope, with the mirror cover closed and the 'Cassegrain' top-end attached. It is seen here from due south. The huge yellow horseshoe bearing moves the telescope in the east-west plane ('right ascension'), riding on oil pads, and its size ensures a smooth tracking motion. The odd angle of the horseshoe reflects the local latitude of the instrument, allowing it to compensate for the earth's rotation during long observations. The white telescope 'tube', seen vertical, allows the telescope to swivel in a north-south direction (declination). December, 1980.

Credit: David Malin

© Australian Astronomical Observatory