Kepler's law starts that square of the time period of any planet moving around the sun in an elliptical orbit of semi-major axis (R) is directly proportional to

A planet of mass m is moving around the sun in an elliptical orbit of semi-major axis a :

A planet is moving around the sun in an elliptical orbit. Its speed is

Consider a planet moving around a star in an elliptical orbit with period T. Area of elliptical orbit is proportional to

Consider a planet moving around a star in an elliptical orbit with period T. Area of elliptical orbit is proportional to

Assertion : For circular orbits, the law of periods is T^(2) prop r^(3) , where M is the mass of sun and r is the radius of orbit. Reason : The square of the period T of any planet about the sun is proportional to the cube of the semi-major axis a of the orbit.

Assertion : For circular orbits, the law of periods is T^(2) prop r^(3) , where M is the mass of sun and r is the radius of orbit. Reason : The square of the period T of any planet about the sum is proportional to the cube of the semi-major axis a of the orbit.

Assertion : For circular orbits, the law of periods is T^(2) prop r^(3) , where M is the mass of sun and r is the radius of orbit. Reason : The square of the period T of any planet about the sum is proportional to the cube of the semi-major axis a of the orbit.