almucantar

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almucantar

(ˌælməˈkæntə) or

almacantar

n
1. (Astronomy) a circle on the celestial sphere parallel to the horizontal plane
2. an instrument for measuring altitudes
[C14: from French, from Arabic almukantarāt sundial]

almucantar

A circle on the celestial sphere that is parallel to the horizontal plane.