Ala Al-Din Abu'l-Hasan Ali Ibn Ibrahim Ibn al-Shatir (1304 – 1375) (Arabic: ابن الشاطر‎) was an Arab Muslim astronomer, mathematician, engineer and inventor who worked as muwaqqit (موقت, religious timekeeper) at the Umayyad Mosque in Damascus, Syria.

Contents

• 1 Astronomy
  • 1.1 Theory
  • 1.2 Testing
  • 1.3 Influence
• 2 Engineering
  • 2.1 Polar-axis sundial
  • 2.2 Time keeping device
  • 2.3 Compendium
  • 2.4 Universal instrument
• 3 See also
• 4 Notes
• 5 References
• 6 External links