ASTRONOMY

ARISTOTLE

• His name is Aristotle
• He further thought that the movement of planets and stars must be circular
• He was one of the first to study plants, animals, and people in a scientific way

Aristarchus

• His name Aristarchus
• The earth rotated around the sun
• Aristarchus figured out how to measure the distancesto and sizes of the Sun and the Moon.

Ptolemy

• His name Ptolemy
• That the earth is immovable
• Ptolemy expanded the number in his own catalog to 1,022 stars.

Copernicus

• His name Copernicus
• Aristotle accepted the idea that there were four physical elements — earth, water, air, and fire
• who proposed that the sun was stationary in the center of the universe and the earth revolved around it

Kepler

• His name Johannes Kepler
• Kepler lived in an era when there was no clear distinction between astronomy and astrology,
• First to formulate eyeglass designing for nearsightedness and farsightedness

Galileo Galilei

• His name Galileo Galilei
• how objects moved on the surface of the earth (dynamics) and of gravity.
• the telescopic confirmation of the phases of Venus, the discovery of the four largest satellites of Jupiter

SOURCE

• http://abyss.uoregon.edu/~js/glossary/ptolemy.html
• http://www.librarypoint.org/early_astronomers
• http://plato.stanford.edu/entries/copernicus/
• http://www.johanneskepler.info/resources/kepler-information/keplers-achieve...
• http://csep10.phys.utk.edu/astr161/lect/history/galileo.html