what is kepler
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In 1609 , johannes kepler published Astronomia Nova, a book containing ten years of his efforts.
To understand the orbit of the planet Mars. He was using state-of-the-art astronomical observation from his mentor and employer,Tycho Brahe , who was famous for generating an enormous amount of high quality data and he needed to find the best explanation for the motions of the mars a very
tricky problem!
keplers first law
===============
There are models of the solar system out there at the time,but none of them worked very well for mars. first the ptolemaic system put the earth at the centre ,with the sun and planets orbiting it in perfect circles .There was also copernicous's heliocentric and planets orbiting
it in perfect circles .There was alsocopernicous's heliocentric model,which set the earth among the planets revolving around the sun.And finally Tycho had his own system to propose which combined aspects of both:he put the earth at the center with the sun and moon orbiting it,but let the other planet orbit the sun.
All three system relied upon circular orbits because a circular was accepted as an ideal shape . copernicous ,Tycho and Galileo all believed that planet should traveled long circular paths but the data didn't find .
Instead keplers found that L1+ another shape the ellipse works a lot better and ellipse is sort of a like a flatened circle and it has some special properties.
in Astronomia Nova keplers state that mars traveled in an elliptical orbit aroun the sun which is at one of the foci of the orbit...
Later on he expanded this first law to include all planets and demonstrated that this shape fit the available observations.
This shape fit the available observations for the further apart the two foci are the longer and skinnier the ellipse and skinniness parameter is called eccentricity.comets can have very eccentric orbits coming in quite close to the sun before traveling back to the outer reaches of the solar system .on the other hand in a perfect circle the two foci would lie right on top of each other right of the center..
The orbits of the planets in our solar system are not very eccentric at all they're really very close a circle which is partly why perfectly round orbits seem like a natural thing to expect in the first place
it was easy to abandon a central idea like that but with his first law of planetary motion keplers rejected circular orbits and show that ellipse can better explain the observed motion of mars .
Generalize to all planets it states that the orbit of a planet follows an ellipse with the sun at one focus
by silu12
In 1609 , johannes kepler published Astronomia Nova, a book containing ten years of his efforts.
To understand the orbit of the planet Mars. He was using state-of-the-art astronomical observation from his mentor and employer,Tycho Brahe , who was famous for generating an enormous amount of high quality data and he needed to find the best explanation for the motions of the mars a very
tricky problem!
keplers first law
===============
There are models of the solar system out there at the time,but none of them worked very well for mars. first the ptolemaic system put the earth at the centre ,with the sun and planets orbiting it in perfect circles .There was also copernicous's heliocentric and planets orbiting
it in perfect circles .There was alsocopernicous's heliocentric model,which set the earth among the planets revolving around the sun.And finally Tycho had his own system to propose which combined aspects of both:he put the earth at the center with the sun and moon orbiting it,but let the other planet orbit the sun.
All three system relied upon circular orbits because a circular was accepted as an ideal shape . copernicous ,Tycho and Galileo all believed that planet should traveled long circular paths but the data didn't find .
Instead keplers found that L1+ another shape the ellipse works a lot better and ellipse is sort of a like a flatened circle and it has some special properties.
in Astronomia Nova keplers state that mars traveled in an elliptical orbit aroun the sun which is at one of the foci of the orbit...
Later on he expanded this first law to include all planets and demonstrated that this shape fit the available observations.
This shape fit the available observations for the further apart the two foci are the longer and skinnier the ellipse and skinniness parameter is called eccentricity.comets can have very eccentric orbits coming in quite close to the sun before traveling back to the outer reaches of the solar system .on the other hand in a perfect circle the two foci would lie right on top of each other right of the center..
The orbits of the planets in our solar system are not very eccentric at all they're really very close a circle which is partly why perfectly round orbits seem like a natural thing to expect in the first place
it was easy to abandon a central idea like that but with his first law of planetary motion keplers rejected circular orbits and show that ellipse can better explain the observed motion of mars .
Generalize to all planets it states that the orbit of a planet follows an ellipse with the sun at one focus
by silu12
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