Equatorium

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An Equatorium (plural: Equatoria) was a medieval astrometic device used by astronomers and astrologers. It was invented in Andalusia (see Al-Andalus), probably in the early 11th century.

It is a mechanical device for finding the positions of the Moon, Sun, and planets without calculation, using a geometrical model to represent the celestial body's mean and anomalistic position.

[edit] See also

• Antikythera mechanism
• Armillary sphere
• Astrarium
• Astrolabe
• Astrology
• Astronomical clock
• Islamic astronomy
• Orrery
• Planetarium
• Prague Orloj
• Sextant
• Sharafeddin Tusi (the inventor of the linear astrolabe)
• Torquetum