'Perihelion' definitions:
Definition of 'perihelion'
noun
Periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun [ant:
aphelion]
Definition of 'Perihelion'
- Perihelion \Per`i*hel"ion\, Perihelium \Per`i*he"li*um\, n.; pl.
Perihelia. [NL., fr. Gr. peri` about, near + "h`lios the
sun.] (Astron.)
That point of the orbit of a planet or comet which is nearest
to the sun; -- opposed to aphelion.
[1913 Webster]
