Happy birthday, Johannes Kepler! He was a German mathematician and astronomer, born today in 1571, who formulated the laws of planetary motion. . . . . . . . . . #kepler #astronomy #math #science #sciecehero #sciencehistory #sciencegoals #history #happybirthday #hbd #otd #onthisday #birthday #planets #universe #gravity #space #astronomy #goals #inspire #inspiration