What does perihelion mean?
The point in the orbit of a planet or comet at which it is closest to the Sun. The point in the orbit of the Moon at which it is closest to the Earth.
Example
"The spacecraft will reach perihelion in January, when it will be about 90 million miles from the Sun."
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.