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 (6,537,000km).[1]
May 5 – Globular cluster Messier 5 (M5, NGC 5904) is discovered by Gottfried Kirch and his wife Maria Margarethe.
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.[2][3]