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almucantar

/ˌælməˈkæntə/
noun
1.
a circle on the celestial sphere parallel to the horizontal plane
2.
an instrument for measuring altitudes
Word Origin
C14: from French, from Arabic almukantarāt sundial
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Encyclopedia Article for almacantar

in astronomy, any circle of the celestial sphere parallel to the horizon; when two objects are on the same almucantar, they have the same altitude. The term also refers to instruments of a pattern invented by the U.S. astronomer Seth Carlo Chandler for determining latitude or time by observing the times of transit of stars across a fixed almucantar.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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