The kinetic energies of a planet in an elliptical orbit about the Sun, at positions, $A, B$ and $C$ are $K_{A}, K_{B} a n d K_{C}$ , respectively. $A C$ is the major axis and $S B$ is perpendicular to $A C$ at the position of the Sun $S$ as shows in the figure. Then

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By angular momentum consentration about the sun, L = I ω = constant K E = L 2 2 I ∵ S A ∠ S B ∠ S C ⇒ I A < I B < I C K E A > K E B > K E C

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