Modern Astronomy Owes This Man!

Mohammad ibn Hassan al-Tusi, commonly known as Nasir al-Din al-Tusi, was a prominent 13th century scholar and an influential figure in the history of science and Islamic thought. His long list of contributions include the founding of the Maragheh observatory, a library with over 400,000 books, and many other contributions in the fields of math, astronomy, and philosophy, among others.