Johannes Kepler
Kepler the Star Inspector
He Explored Planetary Movement
Johannes Kepler explored planetary movement. He discovered that planets' speed varies and provided a foundation for modern astrology from his theories. Johannes Kepler discovered his first two laws about planetary motion in 1609 and the third in 1619.
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He Contributed to Modern Education
His three Laws of Planetary Motion enable scientists to predict paths that planets will take. Now modern astrology has led us to land on the moon and to learn more about gas giants without exposing our expensive rockets to their tumultuous climates.
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Now People Can See and Learn More about Planets
Kepler invented the Keplerian Telescope, which was an improvement over Galileo's refracting telescope design.
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We Still Use the Tools He Improved
Eyeglasses are commonly used today and telescopes are affordable to most people.
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The Laws of Planetary Motion (with Wikipedia links)
2nd Law
- A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.[1]
3rd Law
- The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit.