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About: Sine quadrant     Goto   Sponge   Distinct   Permalink

An Entity of Type : yago:Whole100003553, within Data Space : dbpedia.org associated with source document(s)

Type: Thingyago:WikicatAstronomicalInstrumentsyago:Artifact100021939yago:Device103183080yago:Instrument103574816yago:Instrumentality103575240yago:Object100002684yago:PhysicalEntity100001930settlementyago:Whole100003553 New Facet based on Instances of this Class

The sine quadrant (Arabic: Rub‘ul mujayyab, الربع المجيب‎), sometimes known as the "sinecal quadrant", was a type of quadrant used by medieval Arabic astronomers. The instrument could be used to measure celestial angles, to tell time, to find directions, to perform trigonometric computations, or to determine the apparent positions of any celestial object for any time. The name is derived from the Arabic rub meaning 'a quarter' and mujayyab meaning 'marked with sine'. It was described by Muhammad ibn Mūsā al-Khwārizmī in 9th-century Baghdad, and was used throughout the medieval Islamic period to determine the proper times for Islamic prayer.