Johannes+Kepler+P1

**__Johannes Kepler__**

 * ~Biographical Information~**
 * · I was born on December 27,1571 in Weil der Stadt in Swabia, southwest Germany
 * - He died on November 15, 1630
 * · My father, Heinrich Kepler, was "an immoral, rough and quarrelsome soldier," and I describe my mother in similar unflattering terms. I lived with my grandparents for 2 years from the time I was 3 to the time I was 4.


 * ~Career~**
 * · In 1584 I entered the Protestant seminary at Adleberg, and in 1589 I began my university education at the Protestant university of Tubingen where I studied theology.
 * · In 1594 I became professor of mathematics at Graz.
 * · For six years, Kepler taught arithmetic geometry and rhetoric
 * · In 1600 I assisted Danish astronomer tycho brache with my astronomical research in Prague
 * · 1601 I took over as an imperial mathematician and court astronomer to emperor Rudolf II in Prague upon Brahe’s death
 * · In 1609 I published //Astonomia Nova// Astonomia Nova (New Astronomy) which included the first and second laws of planetary motion.
 * · In 1612 I accepted a position as a mathematician to the states of Upper Austria at Linz.
 * · In 1619 I published //Harmonice Mundi// Harmonice Mundi (Harmony of the World) which contained the third law of planetary motion.

Cosmographic Mystery- I argued that the distances of the planets from the Sun in the Copernican system were determined by the five regular solids, if one supposed that a planet's orbit was circumscribed about one solid and inscribed in another.
 * ~Major Discoveries~**


 * · Law 1: the orbit of a planet/comet around the sun is an ellipse with the Sun’s center of mass at one focus.
 * Law 2: A line joining a planet/comet in the Sun’s sweep out equal areas in equal intervals of time.
 * Law 3: The major squares of the periods of the planets are proportional to the cubes of their semi major axes.

The first law means that the planets revolve around the sun which is an ellipse. An ellipse is a plane curve especially a conic section whose plane is not parallel to the axis, base, or generatix of the intersected cone

The second law means that the line connecting the sun to a planet sweeps equal areas in equal times. Although the orbit is symmetric, the motion is not. A planet speeds up as it approaches the sun. It gets the greatest velocity when passing the closet part of the sun then slows down again and that’s why we have months.

The third law means if two planets have orbital periods T1 and T2 in days or years and mean distances from the sun A1 and A2. (T¹/T²)²= (A¹/A²)³

The first quote means nature uses itself to figure things out and to create new things. The second quote means that God has created the universe and the planets and because I was a Lutheran I had the idea that the planets and universe has to do with a religious thing. It is easier to believe whatever someone tells you or read but to observe for your self is more of a challenge.
 * ~Quotes~**
 * //· “Nature uses as little as possible of anything”//
 * //· “It may be well to wait a century for a reader as God has waited six thousand years for an observer”//

j[|k 2] This site is called the Galileo Project here we found his discoveries. [|johannes kepler] This site is called Johannes Kepler here we found his biography. [|picture #1] This site is called Ask.com here we found picture 1. [|picture #2] This site is called Ask.com here we found picture 2.


 * ~Friends~**

Galileo Galilee Isaac Newton Nicholas Copernicus