Astronomers

Aristotle

Concluded that the Earth was round

Eratosthenes

measured the size of the Earth with a stick and a cast shadow in two different places

Hipparchus

Determined the location of 850 stars and made a quantitative accurate models

Aristarchus

Proposed that the Earth and planets revolved around the sun

Ptolemy

Had a model that accurately predicted the motion of the planets

Copernicus

Proposed a heliocentric model

Brahe

Designed and built instruments to measure locations of heavenly bodies

Kepler

Discovered 3 laws of planetary motion

Galileo

Developed his own telescope and made 5 important discoveries

Newton

Gravitational force decreases with distance