Which Egyptian astronomer and mathematician compiled the Almagest, the most influential astronomical text of antiquity, while working at the Library of Alexandria?

• A Claudius Ptolemy ✓
• B Euclid
• C Hypatia
• D Hero

Claudius Ptolemy (c. 100–170 CE), working in Alexandria, authored the 'Mathematike Syntaxis' (known in Arabic as 'al-Majisti', hence 'Almagest'), a geocentric model of the universe that remained the standard astronomical text in both the Islamic world and Europe for over 1,400 years.