SOLAR SYSTEM

Detailed explanation-1: -The planets revolve around the sun in elliptical path known as orbit. These orbits were well defined by an astronomer Kepler. He formulated three laws which are known as Kepler’s laws of planetary motion. It states that all the planets move around the sun in orbit.

Detailed explanation-2: -The motion of the earth around the sun in its orbit is known as revolution. The earth takes 365.26 days to complete one revolution. The different seasons we experience in a year is a result of this revolution. At the same time the earth’s motion about its own axis is termed as rotation of the earth.

Detailed explanation-3: -"Revolution” refers the object’s orbital motion around another object. For example, Earth rotates on its own axis, producing the 24-hour day. Earth revolves about the Sun, producing the 365-day year. A satellite revolves around a planet.

Detailed explanation-4: -When an object moves around another object in an oval shaped path, it is known to be revolving in an elliptical orbit. All planets move in elliptical orbits around the sun. The Moon also moves around earth in an elliptical orbit.

Detailed explanation-5: -Kepler’s First Law: each planet’s orbit about the Sun is an ellipse. The Sun’s center is always located at one focus of the orbital ellipse. The Sun is at one focus. The planet follows the ellipse in its orbit, meaning that the planet to Sun distance is constantly changing as the planet goes around its orbit.