almucantar


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almucantar

(al-myŭ-kan -ter) A small circle on the celestial sphere parallel to the horizon.

almucantar

[¦al·myü¦kan·tər]
(astronomy)
References in periodicals archive ?
The circles of this grid, known by their Arabic term almucantars, are altitude lines above your local horizon.
1995, Systematic deformations of the apparent almucantar in homogenization astrolabe data for new solution of Earth orientation parameters from optical astrometry.
Besides the hemispheric image, all information (RGB values, cloud classification, and cloud cover) are extracted from almucantar apertures at 30[degrees] and 45[degrees] elevation in order to be analyzed together with corresponding azimuth scans of HATPRO and MIRA-36.
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).