Simon Marius, also known as Simon Meyer,, was a German astronomer. He discovered the Galilean moons of Jupiter and named them, along with Galileo. He was born on January 10, 1573 in Gunzenhausen, Bavaria, and died on December 26, 1624, in Anspach. He was among the first to observe sunspots and studied with Danish astronomer Tycho Brahe. In 1611, he observed the Andromeda Galaxy, referring to it "like a candle seen at night through a horn".
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