For several centuries, from around the 9th to the 15th, the Muslim world was the beating heart of astronomy. Scholars translated and built upon earlier Greek, Indian and Persian knowledge, then advanced it with careful observation, better instruments and grand observatories.
The great Muslim astronomers
- Al-Battānī (858–929) refined the length of the solar year and advanced trigonometry for astronomy.
- Al-Ṣūfī (903–986) wrote the Book of Fixed Stars and recorded the Andromeda galaxy.
- Al-Zarqālī (Arzachel, 1029–1087, Toledo) produced the Toledo astronomical tables and improved the astrolabe.
- Naṣīr al-Dīn al-Ṭūsī (1201–1274) built the great Maragha observatory and devised a planetary model known as the 'Ṭūsī couple'.
- Ibn al-Shāṭir (1304–1375, Damascus) devised planetary models later echoed in the work of Copernicus.
- Ulugh Beg (1394–1449, Samarkand) built a huge observatory and produced a star catalogue of nearly 1,000 stars.
The astrolabe and the star map
The astrolabe has been called the 'hand-held computer of the medieval sky'. With it, an astronomer could measure the positions of stars, tell the time, find the direction of prayer and calculate distances. Muslim craftsmen refined it into a beautiful and precise instrument.
Arabic star names today
Look up the names of many bright stars and you will hear echoes of Arabic. Stars such as Aldebaran, Altair, Betelgeuse, Rigel, Deneb, Vega and Fomalhaut all carry Arabic-derived names — a living legacy of this golden age written across the night sky.
Building on those before
It is important to be fair and accurate: these scholars did not start from nothing. They built on and advanced earlier Greek, Indian and Persian astronomy, translating, correcting and extending it. This honesty is itself part of the spirit of good science — giving credit and seeking truth.
Three scholars worth naming in an answer
Writing “Muslim astronomers made discoveries” earns little. Naming who did what earns a great deal more.
| Scholar | When | What they contributed |
|---|---|---|
| al-Battani | 858 - 929 | Refined the measured length of the solar year, and advanced the trigonometry astronomy depends on |
| al-Sufi | 903 - 986 | Wrote the Book of Fixed Stars, and recorded the Andromeda galaxy |
| al-Zarqali (Arzachel) | 1029 - 1087, Toledo | Produced the Toledo astronomical tables |
This work did not appear from nowhere: these scholars translated and built on earlier Greek, Indian and Persian knowledge, then advanced it with careful observation, better instruments and purpose-built observatories. Knowledge is built by many peoples across many generations.
Match each scholar with their contribution:
- al-Battani
- Refined the length of the solar year
- al-Sufi
- Recorded the Andromeda galaxy in the Book of Fixed Stars
- al-Zarqali
- Produced the Toledo astronomical tables