In his first publication Mysterium Cosmographicum, Johannes Kepler, born December 27, 1571, originally proposed that the planets orbited around five geometric solids. . . . . . . . . . . . #planets #planetarymotion #kepler #sciencehistory #history #science #physics #astronomy #universe #cosmos #space #astronomer #math #mathematician #star #orbit #goals #sciencehero #solarsystem #innovation #discovery #otd #onthisday