Definitions for vertical circle
This page provides all possible meanings and translations of the word vertical circle
Random House Webster's College Dictionary
a great circle on the celestial sphere passing through the zenith.
Origin of vertical circle:
a great circle on the celestial sphere passing through the zenith and perpendicular to the horizon
In astronomy, a vertical circle is a great circle on the celestial sphere that is perpendicular to the horizon. Therefore it passes through the zenith and the nadir. There is a vertical circle for any given azimuth, where azimuth is the angle measured east from the north on the celestial horizon. The vertical circle which is on the east-west direction is called the prime vertical. The vertical circle which is on the north-south direction is called the Local Celestial Meridian or Principal Vertical. Vertical circles are part of the horizontal coordinate system.
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"vertical circle." Definitions.net. STANDS4 LLC, 2014. Web. 28 Jul 2014. <http://www.definitions.net/definition/vertical circle>.