Whose law explains the four Galilean moons orbiting Jupiter with periods tied to their distance from the planet?

Johannes Kepler described the laws of planetary motion in the early 1600s, most famously in Astronomia Nova (1609) and Harmonices Mundi (1619). His third law says that the square of an orbiting body's period is proportional to the cube of its distance from the central body. That principle applies not only to planets around the Sun but also to moons around planets, including Jupiter's four large Galilean moons. Galileo observed those moons in 1610, but Kepler's laws explain their motion mathematically.