hour circle
| Dictionary: hour circle |
n.
A great circle passing through the poles of the celestial sphere and intersecting the celestial equator at right angles.
| 5min Related Video: hour circle |
| Columbia Encyclopedia: hour circle |
hour circle, in astronomy, a secondary axis in the equatorial coordinate system. The hour circle of a celestial body is the great circle on the celestial sphere that passes through both the body and the north celestial pole. A star's hour circle is used in determining its right ascension and declination.
| WordNet: hour circle |
Note: click on a word meaning below to see its connections and related words.
The noun has one meaning:
Meaning #1:
a great circle on the celestial sphere that passes through both celestial poles
Learn More
 | hour angle (astronomy) |
| oblique ascension (astronomy) |
| sidereal hour angle (astronomy) |
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Copyrights:
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 | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved. Read more |
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| Columbia Encyclopedia. The Columbia Electronic Encyclopedia, Sixth Edition Copyright © 2003, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/. Read more |
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| WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. Read more |
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Mentioned in
- hour angle (astronomy)
- oblique ascension (astronomy)
- sidereal hour angle (astronomy)
- equinoctial colure (astronomy)
- declination (in astronomy)
- local sidereal time (astronomy)
- right ascension (astronomy)
- position angle
- local apparent time (astronomy)
- local mean time (astronomy)
- polar distance (astronomy)
- Greenwich hour angle (astronomy)
- Greenwich lunar time (astronomy)
- meridian angle (astronomy)
