Definition of perihelion in English:
noun (plural perihelia /-ˈhēlyə, -ˈhēlēə/ or perihelions)Astronomy
The point in the orbit of a planet, asteroid, or comet at which it is closest to the sun. The opposite of aphelion.
- He calculated to within a month the return in 1759 of Halley's comet to its perihelion (closest point to the Sun).
- For objects orbiting Earth, periapsis and apoapsis are known as perigee and apogee; for objects orbiting the Sun, these locations are known as perihelion and aphelion.
- This affects the climate because the influx of solar energy to our planet would then vary between perihelion and aphelion by a larger proportion than at present.
Definition of perihelion in:
- British & World English dictionary