- died 514 b.c., tyrant of Athens 527–514.
- c190–c125 b.c., Greek astronomer.
- 2nd century bc, Greek astronomer. He discovered the precession of the equinoxes, calculated the length of the solar year, and developed trigonometry
- died 514 bc, tyrant of Athens (527–514)
- a large crater in the SW quadrant of the moon, about 130 kilometres in diameter
- Greek astronomer who mapped the positions of about 850 stars in the earliest known star chart (129 bce). His observations of the heavens formed the basis of Ptolemy’s Earth-centered model of the universe. He was also a pioneer of trigonometry.