A circle on a celestial sphere that runs parallel to the horizon, used in astronomy and navigation.
From Arabic 'al-muqantarah' (the circle), combining 'al' (the) + 'muqantarah' (arch or span). The term entered European astronomy through medieval Islamic scholarship.
Almucantar comes from medieval Islamic astronomy, which was centuries ahead of Europe—Muslims created sophisticated instruments like the astrolabe specifically to measure almucantar circles for prayer times and navigation.
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