perihelion


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perihelion

per·i·he·li·on

 (pĕr′ə-hē′lē-ən, -hēl′yən)
n. pl. per·i·he·li·a (-hē′lē-ə, -hēl′yə)
The point in a solar orbit where the orbiting body is closest to the sun.

[Alteration of New Latin perihēlium : peri- + Greek hēlios, sun; see sāwel- in Indo-European roots.]

per′i·he′li·al (-hē′lē-əl, -hēl′yəl) adj.

perihelion

(ˌpɛrɪˈhiːlɪən)
n, pl -lia (-lɪə)
(Astronomy) the point in its orbit when a planet or comet is nearest the sun. Compare aphelion
[C17: from New Latin perihēlium, from peri- + Greek hēlios sun]

per•i•he•li•on

(ˌpɛr əˈhi li ən, -ˈhil yən)

n., pl. -he•li•a (-ˈhi li ə, -ˈhil yə)
the point in the orbit of a planet or comet at which it is nearest to the sun.
[1660–70; < Greek peri- peri- + hḗli(os) sun + -on neuter n. ending, on the model of perigee; earlier in the New Latin form perihelium]
per`i•he′li•al, per`i•he′li•an, adj.
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perihelion

per·i·he·li·on

(pĕr′ə-hē′lē-ən)
The point nearest the sun in the orbit of a body, such as a planet or comet, that travels around the sun.

perihelion

the point in the orbit of a heavenly body where it is nearest the sun. Also called perihelium. See also aphelion.
See also: Planets
the point in the orbit of a heavenly body where it is nearest the sun. Also spelled perihelium. Cf. aphelion.
See also: Astronomy

perihelion

The point in a planet’s orbit at which it is closest to the Sun.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.perihelion - periapsis in solar orbitperihelion - periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun
periapsis, point of periapsis - (astronomy) the point in an orbit closest to the body being orbited
aphelion - apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun
Translations
References in classic literature ?
For if, in its perihelion, it should approach within a certain degree of the sun (as by their calculations they have reason to dread) it will receive a degree of heat ten thousand times more intense than that of red hot glowing iron, and in its absence from the sun, carry a blazing tail ten hundred thousand and fourteen miles long, through which, if the earth should pass at the distance of one hundred thousand miles from the nucleus, or main body of the comet, it must in its passage be set on fire, and reduced to ashes: that the sun, daily spending its rays without any nutriment to supply them, will at last be wholly consumed and annihilated; which must be attended with the destruction of this earth, and of all the planets that receive their light from it.
At this period the earth was in its perihelion, and the month of December is so propitious to these shooting stars, that astronomers have counted as many as twenty-four thousand in an hour.
These numbers are assigned after a comet's second perihelion passage, which (ideally) confirms the object's periodicity.
Tribune News Network Doha The smallest planet of our solar system planets 'Mercury' will reach perihelion point (nearest point in its orbit around the sun) on Saturday, March 10, 2018, at 2pm Doha local time when Mercury will be at approximately 46 million kilometres from the sun's centre, according to Qatar Calendar house (QCH).
JANUARY 3 - EARTH AT PERIHELION The Earth does not orbit the sun in a perfect circle.
Earth (and all other planets) moves around the Sun in an elliptical orbit, so that Earth's distance from the Sun's centre varies by approximately 3% or between 147mn km at Perihelion and 152mn km at aphelion (outermost point).
The perihelion is the point in the orbit where the planet is closest to its sun.
The last time a spacecraft came close to the star's surface was in 1976, when Helios 2 achieved perihelion - point of the orbit at which it was closest to the Sun - at 27 million miles (43 million kilometres).
He concluded that during the aphelion season (solar longitude Ls between 0[degrees] and 180[degrees]), dust opacity is low and presents low interannual variability; in contrast, during the perihelion season (solar longitude Ls between 180[degrees] and 360[degrees]) the atmosphere is dustier and presents higher interannual variability.
All the objects beyond 150 astronomical units come closest to the sun, a point known as perihelion, at nearly the same time that they cross the plane of the solar system.
It was found that during the final phase of the approach to perihelion (its nearest approach to the Sun); the comet's tail became increasingly faint.