**Gravitation – Notes**

**Kepler’s Law of Gravitation**** **

To resolve shortcomings of the models propounded by Ptolemy and Copernicus, Kepler propounded three laws on planetary motion.

Kepler’s first law, the law of orbits, states that the orbit of a planet is an ellipse with the sun at one of the foci.

An ellipse is a closed, curved shape that is defined by two points called foci representing an elongated circle.

The perihelion is the closest point on a planet’s orbit from the sun.

The aphelion is the farthest point on a planet’s orbit from the sun.

Reviewer

ShikshaHouse

Date

Reviewed Item

CBSE Class 9th Science 10 - Gravitation - Notes

Author Rating