Kep ‧ ler, Jo ‧ han ‧ nes /ˈkepləʳ, jəʊˈhænəs $ -ˈhɑːn-/ BrE AmE
(1571–1630) a German ↑ astronomer (=a scientist who studies the stars) who discovered how the ↑ planet s move around the sun. These principles are known as Kepler’s Laws, and they greatly influenced the work of Sir Isaac ↑ Newton .