Title page from Isaac Newton's Philosophiae Naturalis Principia Mathematica (1687; The Mathematical Principles of Natural Philosophy).

When did Newton publish his work entitled Principia?

The title page of Isaac Newton's Philosophiae Naturalis Principia Mathematica (1687; Mathematical Principles of Natural Philosophy), the work in which the physicist introduced his three laws of motion.

Did Isaac Newton write Principia?

Isaac Newton composed Principia Mathematica during 1685 and 1686, and it was published in a first edition on 5 July 1687.