Kepler

Johannes Kepler was born prematurely on December 27 1571. As a child Kepler was very sickly and weak. Kepler had planned to go into religion life, but he accepted a spot in mathematics and astronomy at Graz. Kepler first astrological work was mysterium cosmographicum. He was the first to describe the eyes for depth perception. Johannes kepler died in Nov. 15,1630. He was in the math, astronomy, astrology, and natural philosophy fields.He was mainly interested in two questions why are there only six planets and how are their orbital periods related to their distance from the sun. For the first question Kerpler hypothesized that the spheres supporting the planets were separated by invisible regular solids which would have only worked for five planets so the the hypothesis had nothing to do with there being six planets. He knew that the outer planets took longer to orbit the sun. Kepler thought that a physical force moved the planets, and that the force slowly stopped with distance. In 1600 Kepler began working as Tycho Brahe's assistant. They both realized that it was easier to measure the distance of mars rather than use geocentric or heliocentric models. Kepler's partner, Brahe, died one year later. Kepler Finally had full acces to Brahe's Data and spent eight years analyzing it. He tried to figure out an orbit that would work woth the data but was unale to. He later figured that the orbit weren't circular but went in an elliptical orbit.

Kepler's Law's of plantary motion were

1) The planets orbits were elliptical 2) An imaginary line connecting a planet and the sun sweeps out equal areas during equal time intervals. The Earth's orbital speed varies at different times of the year. planets move faster when they are closest to the sun: slower when they are farther away. and finally

3) showed the relationship between the size of the planets orbit and its orbit period.