hour angle

noun Astronomy.

the angle, measured westward through 360°, between the celestial meridian of an observer and the hour circle of a celestial body.

Compare sidereal hour angle.

Origin of hour angle

First recorded in 1830–40

Words nearby hour angle

hounskull, Hounslow, Houphouet-Boigny, houppelande, hour, hour angle, hour circle, hourglass, hourglass contraction, hourglass murmur, hourglass stomach

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for hour angle

Otherwise, the confusion of the azimuth with the hour-angle might cause a considerable error.
Chaucer's Works, Volume 3 (of 7)|Geoffrey Chaucer

British Dictionary definitions for hour angle

hour angle

noun

the angular distance along the celestial equator from the meridian of the observer to the hour circle of a particular celestial body

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 angle

hour angle

The angular distance, measured westward along the celestial equator, between the celestial meridian of the observer and the hour circle passing through a celestial body. A body's hour angle is measured in hours, minutes, and seconds, and corresponds to its right ascension as measured with respect to the observer's meridian (which changes with time) rather than the vernal equinox (which is fixed on the celestial equator). A celestial object that crossed the observer's meridian 3 hours and 20 minutes ago has an hour angle of +3 hours 20 minutes. An object that will not cross the meridian for another 3 hours and 20 minutes has an hour angle of -3 hours 20 minutes.

单词	hour angle
释义	hour angle noun Astronomy. the angle, measured westward through 360°, between the celestial meridian of an observer and the hour circle of a celestial body. Compare sidereal hour angle. Origin of hour angle First recorded in 1830–40 Words nearby hour angle hounskull, Hounslow, Houphouet-Boigny, houppelande, hour, hour angle, hour circle, hourglass, hourglass contraction, hourglass murmur, hourglass stomach Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for hour angle Otherwise, the confusion of the azimuth with the hour-angle might cause a considerable error. Chaucer's Works, Volume 3 (of 7)\|Geoffrey Chaucer British Dictionary definitions for hour angle hour angle noun the angular distance along the celestial equator from the meridian of the observer to the hour circle of a particular celestial body 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 angle hour angle The angular distance, measured westward along the celestial equator, between the celestial meridian of the observer and the hour circle passing through a celestial body. A body's hour angle is measured in hours, minutes, and seconds, and corresponds to its right ascension as measured with respect to the observer's meridian (which changes with time) rather than the vernal equinox (which is fixed on the celestial equator). A celestial object that crossed the observer's meridian 3 hours and 20 minutes ago has an hour angle of +3 hours 20 minutes. An object that will not cross the meridian for another 3 hours and 20 minutes has an hour angle of -3 hours 20 minutes. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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