A

David

Darling

Marius, Simon (1573–1624)

Simon Marius was a German astronomer (also known as Mayr) who named Jupiter's Galilean moons. He and Galileo both claimed to have discovered them in 1610 and likely did so independently. Marius was also the first to observe the Andromeda Galaxy with a telescope and one of the first to observe sunspots.