Ironically, his birthday in the Julian calendar of the era was December 25, 1642, and is celebrated by some scientists instead of Christmas.  
This Briton ranked second on Michael Hart's list of the most influential people of all history, behind the prophet Muhammad, and ahead of Jesus. Ironically, his birthday in the Julian calendar of the era was December 25, 1642, and is celebrated by some scientists instead of Christmas.  Such prestige was merited by his contributions to the fields of math and physics. For ten points, name the man who supposed that the force causing an apple to fall also held the moon in its orbit.
This Briton ranked second on Michael Hart's list of the most influential people of all history, behind the prophet Muhammad, and ahead of Jesus.
Sir Isaac {Newton}