JOHANNES KEPLER (:

Done by:V. Ramya

Nur Dayana Mimi Amira

Hanin Insyirah

BIOGRAPHY

December 27, 1571  November 15, 1630  German mathematician,

astronomer and astrologer, and key figure in the 17th century 

CONTRIBUTIONS (: known for his laws of planetary motions Kepler published Astronomia nova (1609)1. Elliptical Orbit Each planet revolves around the Sun in an

orbit First to use focus in mathematical sense The observations and theories proved that

the theory of the circular orbits wrong2. Speed Kepler showed that a planet moves slower

when it is farther away from the Sun

CONTRIBUTIONS

provided the basis for Newton’s theory of gravity

worked in the field of optics and invented an improved version of the refracting telescope called the Keplerian Telescope. This helped to legitimize the telescopic discoveries made by Galileo

CONTRIBUTIONS

Kepler analysed Brahe’s observations of Mars which made Brahe impressed of Keple’s theoretical ideas

Kepler wanted to test his theory based on Brahe’s data but realised that it would take up to 2 years to complete

CONTRIBUTIONS When Brahe died, Kepler was

appointed his successor He had the responsibility of finishing

Brahe’s uncompleted work -Tycho died on October 24 1601. 2

days later, Kepler was appointed as his successor and bore the responsibility of finishing Tycho’s uncompleted work

CONTRIBUTIONS Kepler published astrological calendars very popular helped offset the costs of producing his other work. forecast planetary positions and weather as well as

political events which were accurate due to his keen grasp of contemporary political and theological tensions.

By 1624, however, the escalation of those tensions and the ambiguity of the prophecies meant political trouble for Kepler and his final calendar was publicly burned in Graz.

SIGNIFICANCE His book Epitome of Copernican Astronomy was read

widespread in Europe and continued to spread his ideas after his death

to support Copernicus with substantial evidence, and he consequently did much to help explain the great mystery of planetary orbits.

His work convinced people that the universe was heliocentric and he openly supported Copernicus’s theory.

Kepler's discoveries and intricate calculations were vital as a basis for Isaac Newton later work.

Significance of main contributions Invention and improvement of the refracting

telescope called the Keplerian Telescope, helped to legitimize the telescopic discoveries made by Galileo -> Galileo was then able to make very detailed observations of the stars that he could not have done with the naked eye alone

Integrated physics and astronomy together -> his book tried to explain planetary motions through physical causes -> introduced new ideas/new way of thinking

Spread of his ideas even after his death -> opened up new mindsets

REFERENCES

http://library.thinkquest.org/3461/kepler_m.htm

OURSELVES ♥ I DON’T KNOW WHERE MIMI GOT THE

INFO FROM. (: