What does “Kepler's laws” actually mean in Gravitation, and why does it matter for JEE?
orbits are ellipses; a planet sweeps equal areas in equal times; T² ∝ r³.
In simple words: orbits are ellipses; a planet sweeps equal areas in equal times; T² ∝ r³. Getting Kepler's laws clear matters because JEE questions on Gravitation usually test this idea directly, not just a formula you memorised.
Key point
Kepler's laws
Common mistake
assuming orbital speed is constant — planets move faster near the Sun.
Memory tip
equal-areas means faster at perihelion, slower at aphelion.
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