Question

what is perihelion and aphelion

Answer 1

Perihelion is the point in the orbit of a planet, asteroid, or comet at which it is closest to the star it is orbiting.
Aphelion is the point in the orbit of a planet, asteroid, or comet at which it is farthest from the star it is orbiting.

Answer 2

Answer:

The earth is said to be in perihelion on January 3rd when distance is least or about 147 million km from the Sun and the earth is said to be in aphelion on July 4th when the distance is maximum,i.e.,152 million km from the sun.