Definition of perihelion in English:

perihelion

nounPlural perihelia ˌpɛrɪˈhiːlɪənˌpɛrəˈhiliən

Astronomy

The point in the orbit of a planet, asteroid, or comet at which it is closest to the sun.
today Mercury is at perihelion
The opposite of aphelion
Example sentencesExamples
- 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.
- 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.
- He calculated to within a month the return in 1759 of Halley's comet to its perihelion (closest point to the Sun).
- The radius vector is shortest when the planet is at perihelion and longest at aphelion.
- The problem involved the advance of the perihelion of the planet Mercury.

Origin

Mid 17th century: alteration of modern Latin perihelium (by substitution of the Greek inflection -on), from Greek peri- 'around' + hēlios 'sun'.

Definition of perihelion in US English:

perihelion

nounˌperəˈhēlēənˌpɛrəˈhiliən

Astronomy

The point in the orbit of a planet, asteroid, or comet at which it is closest to the sun.
today Mercury is at perihelion
The opposite of aphelion
Example sentencesExamples
- The problem involved the advance of the perihelion of the planet Mercury.
- The radius vector is shortest when the planet is at perihelion and longest at aphelion.
- 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.
- He calculated to within a month the return in 1759 of Halley's comet to its perihelion (closest point to the Sun).

Origin

Mid 17th century: alteration of modern Latin perihelium (by substitution of the Greek inflection -on), from Greek peri- ‘around’ + hēlios ‘sun’.

单词	perihelion
释义	Definition of perihelion in English: perihelion nounPlural perihelia ˌpɛrɪˈhiːlɪənˌpɛrəˈhiliən Astronomy The point in the orbit of a planet, asteroid, or comet at which it is closest to the sun. today Mercury is at perihelion The opposite of aphelion Example sentencesExamples 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. 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. He calculated to within a month the return in 1759 of Halley's comet to its perihelion (closest point to the Sun). The radius vector is shortest when the planet is at perihelion and longest at aphelion. The problem involved the advance of the perihelion of the planet Mercury. Origin Mid 17th century: alteration of modern Latin perihelium (by substitution of the Greek inflection -on), from Greek peri- 'around' + hēlios 'sun'. Definition of perihelion in US English: perihelion nounˌperəˈhēlēənˌpɛrəˈhiliən Astronomy The point in the orbit of a planet, asteroid, or comet at which it is closest to the sun. today Mercury is at perihelion The opposite of aphelion Example sentencesExamples The problem involved the advance of the perihelion of the planet Mercury. The radius vector is shortest when the planet is at perihelion and longest at aphelion. 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. He calculated to within a month the return in 1759 of Halley's comet to its perihelion (closest point to the Sun). Origin Mid 17th century: alteration of modern Latin perihelium (by substitution of the Greek inflection -on), from Greek peri- ‘around’ + hēlios ‘sun’.
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