almacantar

World English Dictionary
almucantar or almacantar (ˌælməˈkæntə)
 
n
1.  a circle on the celestial sphere parallel to the horizontal plane
2.  an instrument for measuring altitudes
 
[C14: from French, from Arabic almukantarāt sundial]
 
almacantar or almacantar
 
n
 
[C14: from French, from Arabic almukantarāt sundial]

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Encyclopedia Britannica
Encyclopedia

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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