Constellations

Invention/Contribution

• Muslim astronomers carefully studied and recorded constellations as part of their work in astronomy.

• Al-Sufi (Azophi, 903–986) wrote the Book of Fixed Stars, cataloguing over 1,000 stars and revising Ptolemy’s work with new observations.

• His book included the first known star maps with constellations drawn in detail, naming many stars still used today (e.g., Altair, Aldebaran, Betelgeuse).

• Constellations were used for navigation, timekeeping, and determining the qibla (direction of Mecca).

Why it matters

• Preserved and expanded Greek astronomy while adding new discoveries.

• Influenced European star charts during the Renaissance.

• Many star names in modern astronomy come from Arabic, showing Muslim legacy in the night sky.

“The Arabs preserved and expanded Ptolemy’s constellations, passing them on to Europe, where many of their Arabic star names are still in use.”

Jalal al-Din Rumi (13th century)

When Muslims looked at the stars, they saw both constellations and opportunities for science. In the 10th century, Al-Sufi mapped the heavens in his Book of Fixed Stars, recording star positions with great accuracy. Many stars we know today — like Aldebaran and Betelgeuse — still carry their Arabic names. For Muslims, constellations guided travelers, marked seasons, and pointed to Mecca. Their star charts lit the way for Europe’s astronomers and left a legacy written in the night sky.