Astronomy diagrams, 1823

Astronomy diagrams, 1823


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Astronomy diagrams, 19th century. At centre is an armillary sphere, a device with moveable interlocking rings representing the circles of the celestial sphere. It is used to demonstrate the motion of the stars around the Earth. The circles of the celestial sphere are shown across top and either side of the armillary sphere: horizon, vertical, equator, horary, declination, latitude, almacantar, meridian, position. Two historical views of the solar system are also shown: the Tychonic system of Tycho Brahe (lower left) and the Ptolemaic system of Ptolemy (lower right). This page is from 'Universal Technological Dictionary' (1823) by British author George Crabb (1778-1851).

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