State keplers laws of planetary motion and show that law of area is the outcome of law of conservation of angular momentum
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In astronomy, Kepler's laws of planetary motion are three scientific laws describing the motion of planets around the Sun.

Figure 1: Illustration of Kepler's three laws with two planetary orbits.
The orbits are ellipses, with focal points F1 and F2 for the first planet and F1 and F3 for the second planet. The Sun is placed in focal point F1.The two shaded sectors A1 and A2have the same surface area and the time for planet 1 to cover segment A1is equal to the time to cover segment A2.The total orbit times for planet 1 and planet 2 have a ratio {\textstyle \left({\frac {a_{1}}{a_{2}}}\right)^{\frac {3}{2}}}.
The orbit of a planet is an ellipse with the Sun at one of the two foci.A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.[1]The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit.
Most planetary orbits are nearly circular, and careful observation and calculation are required in order to establish that they are not perfectly circular. Calculations of the orbit of Mars, whose published values are somewhat suspect,[2] indicated an elliptical orbit. From this, Johannes Kepler inferred that other bodies in the Solar System, including those farther away from the Sun, also have elliptical orbits.
Kepler's work (published between 1609 and 1619) improved the heliocentric theory of Nicolaus Copernicus, explaining how the planets' speeds varied, and using elliptical orbits rather than circular orbits with epicycles.[3]
Isaac Newton showed in 1687 that relationships like Kepler's would apply in the Solar System to a good approximation, as a consequence of his own laws of motion and law of universal gravitation.

Figure 1: Illustration of Kepler's three laws with two planetary orbits.
The orbits are ellipses, with focal points F1 and F2 for the first planet and F1 and F3 for the second planet. The Sun is placed in focal point F1.The two shaded sectors A1 and A2have the same surface area and the time for planet 1 to cover segment A1is equal to the time to cover segment A2.The total orbit times for planet 1 and planet 2 have a ratio {\textstyle \left({\frac {a_{1}}{a_{2}}}\right)^{\frac {3}{2}}}.
The orbit of a planet is an ellipse with the Sun at one of the two foci.A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time.[1]The square of the orbital period of a planet is proportional to the cube of the semi-major axis of its orbit.
Most planetary orbits are nearly circular, and careful observation and calculation are required in order to establish that they are not perfectly circular. Calculations of the orbit of Mars, whose published values are somewhat suspect,[2] indicated an elliptical orbit. From this, Johannes Kepler inferred that other bodies in the Solar System, including those farther away from the Sun, also have elliptical orbits.
Kepler's work (published between 1609 and 1619) improved the heliocentric theory of Nicolaus Copernicus, explaining how the planets' speeds varied, and using elliptical orbits rather than circular orbits with epicycles.[3]
Isaac Newton showed in 1687 that relationships like Kepler's would apply in the Solar System to a good approximation, as a consequence of his own laws of motion and law of universal gravitation.
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Heya mate
The answer of ur question is
☆ Kelper gave three laws of the planetary motion .
1 ) Law of Orbit - It states that planets revolve around the sun in an eliptical orbit with sun at one of its foci.
2 ) Law of Area - According to this law , planets sweeps out equal area and equal interval of time .
Or ARIAL VELOCITY OF THE PLANET IS ALWAYS CONSTANT .
3) Law of period - It states that
Square of time period of the planet is directly proportional to the cube of its radius of the major axis .
hope it helps
The answer of ur question is
☆ Kelper gave three laws of the planetary motion .
1 ) Law of Orbit - It states that planets revolve around the sun in an eliptical orbit with sun at one of its foci.
2 ) Law of Area - According to this law , planets sweeps out equal area and equal interval of time .
Or ARIAL VELOCITY OF THE PLANET IS ALWAYS CONSTANT .
3) Law of period - It states that
Square of time period of the planet is directly proportional to the cube of its radius of the major axis .
hope it helps
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