Johannes Kepler (jul 1, 1571 – mar 1, 1630)

Description:

Kepler is a key figure in the 17th-century
scientific revolution. He is best known for
his three laws of planetary motion:
- 1
st Law (Law of Orbits): All planets move
in elliptical orbits, with the Sun at one
focus.
- 2
nd Law (Law of Equal Areas): The line
joining the planet to the Sun sweeps out
equal areas in equal times as the planet
travels around the ellipse.
- 3
rd Law (Law of Periods/Harmonic Law):
The square of the orbital period of a planet
is directly proportional to the cube of the
semi-major axis of its orbit. The further the
planet is from the Sun, the more time it
takes the planet to make a complete trip
around the Sun. This law provided one of
the foundations for Isaac Newton's theory
of universal gravitation.
In 1611, Kepler invented Keplerian
telescope, which used two convex lens,
enabling higher magnification level than
GalileoGalilei’s telescope.

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