?580–?500 bc, Greek philosopher and mathematician. He founded a religious brotherhood, which followed a life of strict asceticism and greatly influenced the development of mathematics and its application to music and astronomy
a deep crater in the NE quadrant of the moon, 136 kilometres in diameter
Greek philosopher and mathematician who theorized that numbers constitute the essence of all natural things. He developed the Pythagorean theorem and was one of the first to apply mathematical order to observations of the stars.