1. [ noun ] (physics,astronomy) a law concerning the speed at which planets travel; a line connecting a planet to the sun will sweep out equal areas in equal times
Synonyms: law_of_equal_areas law_of_areas

"Kepler's second law means that a planet's orbital speed changes with its distance from the sun"

Related terms: Kepler's_law
Similar spelling:   Kepler's_third_law