Definitions

1. noun

The point in the orbit of a celestial body at which it is closest to the body it is orbiting, such as the Earth or the Sun.

“The planet’s perihelia coincided with the summer solstice.”

2. plural noun

The perihelia of a celestial body, especially the points in its orbit when it is closest to the body it is orbiting.

“The perihelia of the planets in our solar system are of great interest to astronomers.”