almucantar

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Related to almucantars: Almucantar staff

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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

almucantar

A circle on the celestial sphere that is parallel to the horizontal plane.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
References in periodicals archive ?
The circles of this grid, known by their Arabic term almucantars, are altitude lines above your local horizon.
She points out, for example, that "the projection of the semicircular ribs of the Trinity barrel vault is directly analogous to the astrolabist's method of projecting almucantars (circles of celestial latitude) ranging above the observed horizon" (99).
The horizontal sky lines that divide up our zones, incidentally, are called almucantars, an old Arabic term for the altitude circles of the altazimuth coordinate system.