| 单词 | hour circle |
| 释义 | hour circlenoun Astronomy.a great circle on the celestial sphere passing through the celestial poles and containing a point on the celestial sphere, as a star or the vernal equinox. Also called circle of declination. Origin of hour circleFirst recorded in 1665–75 Words nearby hour circleHounslow, Houphouet-Boigny, houppelande, hour, hour angle, hour circle, hourglass, hourglass contraction, hourglass murmur, hourglass stomach, hour hand Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for hour circlehour circle nouna great circle on the celestial sphere passing through the celestial poles and a specified point, such as a star Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for hour circlehour circle A great circle passing through the poles of the celestial sphere and intersecting the celestial equator at right angles. An hour circle is equivalent to a meridian on Earth and is used in describing the position of a celestial body with respect to an observer's celestial meridian. See more at hour angle. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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