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American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Astronomy) astronomy a great circle on the celestial sphere passing through the zenith and perpendicular to the horizon
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a great circle on the celestial sphere passing through the zenith.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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|Noun||1.||vertical circle - a great circle on the celestial sphere passing through the zenith and perpendicular to the horizon|
great circle - a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
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