April 20 - Comet of 1702 (C/1702 H1): The 10th-closest comet approach in history, it missed Earth by a distance of 0.0437 AU (6,537,000 km) [REF].
David Gregory publishes the first textbook, Astronomiae physicae et geometricae elementa, the first astronomy textbook based on Isaac Newton's principles of motions and theory of gravitation [REF].