When a planet is nearer to the Sun it moves fastest as compared to the planet far away from the Sun. That is the aerial velocity of the planets remains constant. Now the planet moves future from P3 to P4 and the area covered is Δt.Īs the area traveled by the planet from P 1 to P 2 and P 3 to P 4 is equal, therefore this law is known as the Law of Area. So it revolves from point P 1 to P 2, as it moves the area swept from P 1 to P 2 is Δt. We can see in the above figure, the Sun is located at the focus and the planets revolve around the Sun.Īssume that the planet starts revolving from point P 1 and travels to P 2 in a clockwise direction. The rate of change of area with time will be constant. The line joining a planet to the Sun sweeps out equal areas in equal interval of time. In an ellipse, we have two focus. Sun is located at one of the foci of the ellipse. But according to Kepler, he said that it is true that planets revolve around the Sun, but not in a circular orbit but it revolves around an ellipse. We know that planets revolve around the Sun in a circular orbit. The orbit of any planet is an ellipse around the Sun with Sun at one of the two foci of an ellipse. This law is popularly known as the law of orbits. Kepler’s Law of Periods – The square of the time period of the planet is directly proportional to the cube of the semimajor axis of its orbit.Kepler’s Law of Areas – The line joining a planet to the Sun sweeps out equal areas in equal interval of time.Kepler’s Law of Orbits – The Planets move around the sun in elliptical orbits with the sun at one of the focii.
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