This mathematical astronomer was born in the year 85 AD and died in the year 165 AD. He spent his life in Alexandria, Egypt developing ways to prove the Sun Traveled around the Earth through trigonometry. Well respected scientists like Newton are known for criticizing his work because of the inaccuracies found in the maps he made. But, the tiny changes he made to the equinox and solstice times developed by HIpparchus still hold up. There is a crater on the moon named after him, Crater Ptolemaeus.