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Planet vs Periherm - What's the difference?

planet | periherm |

In astronomy terms the difference between planet and periherm

is that planet is a body which orbits the Sun directly and is massive enough to be in hydrostatic equilibrium (effectively meaning a spheroid) and to dominate its orbit; specifically, the eight major bodies of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. (Pluto was considered a planet until 2006 and has now been reclassified as a dwarf planet. while periherm is in an orbit around the planet Mercury, the point that is closest to Mercury.

As nouns the difference between planet and periherm

is that planet is each of the seven major bodies which move relative to the fixed stars in the night sky—the Moon, Mercury, Venus, the Sun, Mars, Jupiter and Saturn while periherm is in an orbit around the planet Mercury, the point that is closest to Mercury.

planet

English

(wikipedia planet)

Noun

(en noun)
  • *, II.12:
  • *:Be they not dreames of humane vanity,?
  • *1749 , (Henry Fielding), Tom Jones , Folio Society, 1973, p.288:
  • *:The moonbegan to rise from her bed, where she had slumbered away the day, in order to sit up all night. Jones had not travelled far before he paid his compliments to that beautiful planet , and, turning to his companion, asked him if he had ever beheld so delicious an evening?
  • *1971 , , Religion and the Decline of Magic , Folio Society, 2012, p.361:
  • *:Another of Boehme's followers, the Welshman Morgan Llwyd, also believed that the seven planets could be found within man.
  • (lb) A body which orbits the Sun directly and is massive enough to be in hydrostatic equilibrium (effectively meaning a spheroid) and to dominate its orbit; specifically, the eight major bodies of Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. (Pluto was considered a planet until 2006 and has now been reclassified as a dwarf planet.)
  • *1640 , (John Wilkins), (title):
  • *:A Discovrse concerning a New Planet'. Tending to prove, That 'tis probable our Earth is one of the ' Planets .
  • *2006 , Alok Jha, The Guardian , 22 December:
  • *:Their decision will force a rewrite of science textbooks because the solar system is now a place with eight planets' and three newly defined "dwarf ' planets "—a new category of object that includes Pluto.
  • A large body which directly orbits any star (or star cluster) but which has not attained nuclear fusion.
  • In phrases such as the planet'', ''this planet , sometimes refers to the Earth.
  • *
  • *:"My tastes," he said, still smiling, "incline me to the garishly sunlit side of this planet ." And, to tease her and arouse her to combat: "I prefer a farandole to a nocturne; I'd rather have a painting than an etching; Mr. Whistler bores me with his monochromatic mud; I don't like dull colours, dull sounds, dull intellects;."
  • *{{quote-magazine, date=2013-06-07, author=David Simpson
    • , volume=188, issue=26, page=36, magazine=(The Guardian Weekly) , title= Fantasy of navigation , passage=It is tempting to speculate about the incentives or compulsions that might explain why anyone would take to the skies in [the] basket [of a balloon]:

    Usage notes

    The term planet'' originally meant any star which wandered across the sky, and generally included comets and the Sun and Moon. With the Copernican revolution, the Earth was recognized as a planet, and the Sun was seen to be fundamentally different. The Galileian satellites of Jupiter were at first called planets (satellite planets), but later reclassified along with the Moon. The first asteroids were also thought to be planets, but were reclassified when it was realized that there were a great many of them, crossing each other's orbits, in a zone where only a single planet had been expected. Likewise, Pluto was found where an outer planet had been expected, but doubts were raised when it turned out to cross Neptune's orbit and to be much smaller than the expectation required. When Eris, an outer body more massive than Pluto, was discovered, the International Astronomical Union (IAU) officially defined the word ''planet as above. However, a significant minority have refused to accept the IAU definition. Many simply continue with the nine planets that had been recognized prior to the discovery of Eris. Others are of the opinion that orbital parameters should be irrelevant, and that any equilibrium (?spherical) body in orbit around a star is a planet; there are likely several hundred such bodies in the Solar system. Still others argue that orbiting a star should also be irrelevant, thus re-accepting the Galileian satellites (as well as a dozen other moons) as planets. Note that the 2006 IAU definition defines a planet in respect to the Sun, and is thus technically inapplicable to exoplanets.

    Synonyms

    * *

    Derived terms

    (terms derived from "planet") * carbon planet * carbide planet * diamond planet * dual planet * dwarf planet * exoplanet * extrasolar planet * free-floating planet * gas giant planet * giant planet * ice giant planet * interstellar planet * inner planet * major planet * mesoplanet * minor planet * outer planet * Planet Earth * planemo * planetar * planetary-mass object * planetary * planetarium * planetesimal * planetoid * planet-ruler * planet-struck * satellite planet * silicate planet * silicon planet * superplanet * supergiant planet * terrestrial planet * water planet

    Related terms

    * gas giant * ice giant * sub-brown dwarf * planetary object

    See also

    * * moon * orbit

    References

    * First Steps to Astronomy and Geography , 1828, (Hatchard & Son: Piccadilly, London).

    Anagrams

    * * ----

    periherm

    English

    Noun

    (en noun)
  • (astronomy) In an orbit around the planet Mercury, the point that is closest to Mercury.

    • Antonyms

    * (a point in an orbit around the planet Mercury) apoherm

    References

    *BepiColombo Mission

    See also

    * periapsis * perihelion * perigee