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Title: Jabir b. Aflah's on the four-eclipse method for finding the lunar anomaly period
Author: Bellver Martínez, José
Keywords: Astronomia àrab
Astronomia antiga
Eclipsis lunars
Arab astronomy
Ancient astronomy
Lunar eclipses
Ptolemeu, Claudi, ca. 90-ca. 168
Geber, 1100-1160
Issue Date: 2006
Publisher: Universitat de Barcelona
Abstract: The four-eclipse method was used by pre-Ptolemaic astronomers, especially Hipparchus, for finding the lunar period in anomaly. It is described by Ptolemy in Almagest IV.2 where he adds new considerations to be fulfilled in order to obtain a correct period in anomaly. Jabir b. Aflab, who lived in early twelfth-century al-Andalus, considers this method in his Islāh al-Majistī. In his opinion, Ptolemy did not understand the conditions stated by the ancients. Jābir b. Aflah provides a complete set of conditions that makes Ptolemy's additions to the method unnecessary. In any case, the method presented by Jābir b. Aflah is more coherent and elegant from a mathematical point of view that Ptolemy's.
Note: Reproducció del document publicat a:
It is part of: Suhayl. Journal for the History of the Exact and Natural Sciences in Islam, 2006, vol. 6, p. 159-248
ISSN: 1576-9372
Appears in Collections:Articles publicats en revistes (Filosofia)

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