armillary sphere
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armillary sphere
noun Astronomy.
an ancient instrument consisting of an arrangement of rings, all of which are circles of the same sphere, used to show the relative positions of the celestial equator, ecliptic, and other circles on the celestial sphere.
Origin:
1550–60
1550–60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To armillary sphere
Collins
World English Dictionary
| armillary sphere | |
| —n | |
| a model of the celestial sphere consisting of rings representing the relative positions of the celestial equator, ecliptic, etc, used by early astronomers for determining the positions of stars | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Armillary sphere
is always a great word to know.
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| the offspring of a zebra and a donkey. |
| a stew of meat, vegetables, potatoes, etc. |
American Heritage
Science Dictionary
armillary sphere  (är'mə-lěr'ē, är-mĭl'ə-rē) Pronunciation Key
An early astronomical device made of fixed and movable rings representing circles of the celestial sphere, such as the ecliptic and the celestial equator. It was used as early as the third century BCE as both a teaching instrument and an observational tool. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia
armillary sphere
early astronomical device for representing the great circles of the heavens, including in the most elaborate instruments the horizon, meridian, Equator, tropics, polar circles, and an ecliptic hoop. The sphere is a skeleton celestial globe, with circles divided into degrees for angular measurement. In the 17th and 18th centuries such models-either suspended, rested on a stand, or affixed to a handle-were used to show the difference between the Ptolemaic theory of a central Earth and the Copernican theory of a central Sun.
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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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