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Ibn al-Shatir or Ibn ash-Shatir ((アラビア語:ابن الشاطر); 1304–1375) was an Arab Islamic astronomer. He worked as ''muwaqqit'' (موقت, religious timekeeper) in the Umayyad Mosque in Damascus and constructed a magnificent sundial for its minaret in 1371/72. His most important astronomical treatise was ''kitab nihayat al-sul fi tashih al-usul'' ("The Final Quest Concerning the Rectification of Principles"). In it he drastically reformed the Ptolemaic models of the Sun, Moon and planets, eliminating the eccentric and equant by introducing extra epicycles. Although his system was firmly geocentric (he had eliminated the Ptolemaic eccentrics), the mathematical details of his system were identical to those in Copernicus's ''De revolutionibus''.〔The model Copernicus used in his earlier ''Commentariolus'' differs in minor detail from that of ibn al-Shatir. V. Roberts and E. S. Kennedy, "The Planetary Theory of Ibn al-Shatir", ''Isis'', 50(1959):232-234. (jstor )〕 It is unknown whether Copernicus read ibn al-Shatir. ==See also== *List of Arab scientists and scholars *Islamic scholars 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ibn al-Shatir」の詳細全文を読む スポンサード リンク
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