Question

1. differentiate between perihelion and aphelion.

Explanation:

Perihelion is the point in an object's orbit around the Sun where it is closest to the Sun. Aphelion is the point in the orbit where the object is farthest from the Sun. These terms are used mainly for objects in the solar - system orbiting the Sun, like planets, comets, etc.

Answer:

Perihelion is the closest point to the Sun in an orbit, while aphelion is the farthest point from the Sun in an orbit.