Nur ad-Din al-Bitruji
Nur ad-Din al-Bitruji (Arabic: نور الدين ابن إسحاق البطروجي) (also spelled Nur al-Din Ibn Ishaq al-Betrugi and Abu Ishâk ibn al-Bitrogi) (known in the West by the Latinized name of Alpetragius) (died c. 1204) was an Andalusian-Arab astronomer and a Qadi in al-Andalus. Al-Biṭrūjī was the first astronomer to present a non-Ptolemaic astronomical system as an alternative to Ptolemy's models, with the planets borne by geocentric spheres. Another original aspect of his system was that he proposed a physical cause of celestial motions. His alternative system spread through most of Europe during the 13th century.
Nur ad-Din al-Bitruji | |
|---|---|
| Born | 12th century |
| Died | c. 1204 |
| Academic background | |
| Influences | Avempace, Ibn Tufail, al-Zarqali |
| Academic work | |
| Era | Islamic Golden Age |
| Main interests | Astronomy |
| Notable works | Kitāb al-Hayʾah |
| Notable ideas | First non‐Ptolemaic astronomical system; physical cause of celestial motions |
| Influenced | Grosseteste, Albertus Magnus, Roger Bacon, Regiomontanus, Copernicus |
The crater Alpetragius on the Moon is named after him.
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