Vertical Circle

A great circle of the celestial sphere, through the zenith and nadir. Vertical circles are perpendicular to the horizon.

Prime Vertical Circle

The prime vertical circle or prime vertical passes through the east and west points of the horizon.

Principal Vertical Circle

The principal vertical circle passes through the north and south points of the horizon and coincides with the celestial meridian.

See also: Great Circle.

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Subjects: Astronomy