Info - Northbrook School District 28

Johannes Kelper
Born- December 27 1571 in Germany
Died- November 15 1630
Info- Johnannes Kelper was a German mathematician,
astronomer and astrologer. He was a main character in the
17th century scientific revolution. He his best known for his 3
laws of planetary motion. It was his law that laid part of the
foundation for Isaac Newtonʼs theory of universal gravitation.
During his work life he taught math at a seminary school in
Austria assistant to Tycho Brahe, the court mathematician to
Emperor Rudolf II. He also did work in optics where he invented
an improved version of the refracting telescope, the Keplerian
Telescope, and helped to legitimize the telescopic discoveries
of his contemporary Galileo Galilei. Kepler introduced religous
arguments and reson in his work, conpeled by the religious
conviction that God had created the world according to an
intelligible plan form the natural light of reason. We travel more
into the life of Johnannes Kelper in the Info section.
His big discovery was first observed by Kelper after an
observation of Mars. Which eventually developed into the three
laws.
His laws state:
are:
1. The orbit of every planet is an ellipse with the Sun at a
focus.
2. A line joining a planet and the Sun sweeps out equal
areas during equal intervals of time.
3. The square of the orbital period of a planet is directly
proportional to the cube of the semi-major axis of its orbit.
1
2
3
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