1618 – Johannes Kepler confirms his previously rejected discovery of the third law of planetary motion (he first discovered it on March 8 but soon rejected the idea after some initial calculations were made).
1618: Johannes Kepler confirmă descoperirea celei de-a treia legi a mișcării planetelor (el a descoperit-o prima data de 8 martie, dar curând a respins ideea după ce s-au făcut unele calcule inițiale).