All planets move in elliptical orbits around the Sun with the Sun at one of the foci of the ellipse.
Explanation:
1. The figure M shows the orbit of a around the planet P Sun.
2. Here, S and S’ are the foci of the ellipse and the Sun is situated at S.
3. P is the closest point along the orbit from S and is called perihelion.
4. A is the farthest point from S and is called aphelion.
5. PA is the major axis whose length is 2a. PO and AO are the semimajor axes with lengths ‘a’ each.
MN is the minor axis whose length is 2b. MO and ON are the semiminor axes with lengths ‘b’ each.
