Celestial Meridian

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Celestial Meridian

A great circle of the celestial sphere, through the celestial poles and the zenith.
The expression usually refers to the upper branch, that half of the great circle from pole to pole which passes through the zenith; the other half being the lower branch. The celestial meridian coincides with the hour circle through the zenith and the vertical circle through the elevated pole.

References

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