Vertical Circle

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Vertical Circle

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A great circle of the celestial sphere, through the zenith and nadir. Vertical circles are perpendicular to the horizon. </dd>
The prime vertical circle or prime vertical passes through the east and west points of the horizon. The principal vertical circle passes through the north and south points of the horizon and coincides with the celestial meridian. </dd>

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use