Definitions for vertical circle
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Random House Webster's College Dictionary
ver′tical cir′cle(n.)
a great circle on the celestial sphere passing through the zenith.
Category: Astronomy
Origin of vertical circle:
1550–60
Princeton's WordNet
vertical circle(noun)
a great circle on the celestial sphere passing through the zenith and perpendicular to the horizon
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"vertical circle." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/vertical circle>.

