Hooke observed that the planet Jupiter rotates on its axis, and his sketches of Mars were used two centuries later to determine the planet’s rate of rotation.
Hooke pani tähele, et planeet Jupiter pöörleb ümber oma telje, lisaks olid tema visandid Marsist aluseks, mille järgi paar sajandit hiljem määrati kindlaks selle planeedi pöörlemiskiirus.