Nur ad-Din al-Bitruji

Abu Ishaq Nur ad -Din al - Bitrudschi al - Ischbili (Arabic أبو إسحاق نور الدين البطروجي الإشبيلي, DMG Abu Ishaq Nūr ad - Din al - Biṭrūǧī al - Išbīlī, other transcriptions: Ishak; Only Ed- Din, Nur al - Din; Betrugi al, Al - Bitruji, al - Bitrogi, al - Bidrudschi; latinized: Alpetragius; † around 1204) was an Arab astronomer and philosopher in the heyday of Islam.

Born in Andalusia, where he became a pupil of Ibn Tufail and was a contemporary of Averroes.

He improved the theory of planetary motion and wanted while avoiding the epicycle. This was a modification of the system of planetary motion, which his predecessors had Ibn Tufail and Ibn Baddscha erected. His efforts to replace Claudius Ptolemy's planetary model were unsuccessful because of its imprecise numerical predictions of the planetary positions.

The lunar crater Alpetragius is named after him.

Works

• Kitab al - Hayah / كتاب الحياة / kitāb al - Hayah (after 1185 ) translated into Latin 1217von Michael Scotus, edited by FJ Carmody: al- Bitruji: De motibus coelorum, University of California Press, Berkeley, 1952.
• Translated in 1259 by Moshe ibn Tibbon into Hebrew
• Translated in 1528 on the basis of the Hebrew into Latin by Kalonimos transfer ben David, printed in 1531 in Venice.