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.
The numerical value of vertical circle in Chaldean Numerology is: 6
The numerical value of vertical circle in Pythagorean Numerology is: 5
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"vertical circle." Definitions.net. STANDS4 LLC, 2017. Web. 30 Mar. 2017. <http://www.definitions.net/definition/vertical circle>.