Ibn al-Shatir planetary model
E311987
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The Ibn al-Shatir planetary model is a 14th-century geocentric astronomical system that replaced Ptolemy’s equant with epicycles to more accurately predict planetary motions and anticipated key mathematical features of later heliocentric models.
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Islamic astronomy
("Ibn al-Shatir's Nihayat al-Sul fi Tashih al-Usul")
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Islamic astronomy
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