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Kepler’s second law states that the
  • A
    radius vector Sun Earth-sweeps out equal areas in equal time.
  • B
    area swept out by the radius vector Sun-Earth per hour increases with increasing length of the radius vector.
  • C
    radius vector Sun-Earth moves at constant angular speed.
  • D
    length of the radius vector Sun-Earth is directly proportional to the square root of its angular speed.

Refer to figure.
Kepler's three laws of Planetary Motion can be described as follows:

  • The path of the planets about the sun is elliptical in shape, with the center of the sun being located at one of the foci. (The Law of Ellipses)
  • An imaginary line drawn from the center of the sun to the center of the planet will sweep out equal areas in equal intervals of time. (The Law of Equal Areas)
  • The ratio of the squares of the periods of any two planets is equal to the ratio of the cubes of their average distances from the sun. (The Law of Harmonies)

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