Copernicus

to Copernicus lived from 1473 to 1543. He was a heliocentric. Cornipicus was the first to propose the theory that the earth revolves around the sun.

http://www.phy6.org/stargaze/Ssolsys.htm

Pope Gregory

Pope Gregory lived from 1502 to 1585. He was a Geocentric. He changed the European calandar to the calender we use today.

Brahe

Tycho Brahe lived from 1546 to 1601.He was a heliocentric. Brahe Detected and fixed several large mistakes in the astronomical tables. He also found a supernova in the constellation Cassiopeia.

Isaac Newton

Newton lived from 1642 to 1727. He was a heliocentric. Newton invented calculus to show why the planets stayed in orbit around the sun. He named the physical force Kepler found Gravity.

Kepler

Kepler lived from 1571 to 1630. Kepler was a heliocentric. He was the first one to hypothisize that the planets were moved by a physical force. Kepler also found out that a planets orbit is elliptical, and not circular.

Galileo

Galileo was born in 1564 and died in 1642. He was a heliocentric. he completed the first complete astronomical telescope. Galileo diccovered the Milky Way is made up of stars.

http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Galileo.html

Hipparchus

Hipparchus lived from 190 B.C. to 120 B.C. He was a heliocentric. Hipparchus improved the accuracy of the lunar calendar. He invented the chord table to find where stars were in the skys. Hipparchus also discovered the precession of the equinoxes. He made a catalogue of over 850 stars, after he discovered a new star in 134 B.C

Aristotle and Astronomy

Aristotle Lived from 384 to 322 B.C. He was a geocentric. Aristotle was one of the first people to say the aerth was spherical. IN his time there were four elememts that were accepted by society: earth, wind, fire, and water. Aristotle believed there was another element; one that made up celestial bodies, and he called it aether. We now know that there are many more then five elements, and the elements accepted then are not even elements, but PLatos ideas were used in his time, and were used for a long time after his death.





http://www.perseus.tufts.edu/GreekScience/Students/Tom/AristotleAstro.html