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主な意味 | 惑星、(人間の運命・人事を左右すると考えられた)運星 |
音節 | plan・et | 発音記号・読み方 |
planetの |
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planetの | レベル:2英検:準2級以上の単語学校レベル:高校1年以上の水準TOEIC® L&Rスコア:350点以上の単語大学入試:センター試験対策レベル |
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Weblio英和対訳辞書での「planet」の意味 |
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planet
Planet
Planet (locomotive)
Planet (software)
Wiktionary英語版での「planet」の意味 |
planet
語源
From Middle English planete, from Old French planete, from Latin planeta, planetes, from Ancient Greek πλανήτης (planḗtēs, “wanderer”) (ellipsis of πλάνητες ἀστέρες (plánētes astéres, “wandering stars”)), from Ancient Greek πλανάω (planáō, “wander about, stray”), of unknown origin. Cognate with Latin pālor (“wander about, stray”), Old Norse flana (“to rush about”), and Norwegian flanta (“to wander about”). More at flaunt.
名詞
- (now historical or astrology) 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. [from 14thc.]
- (astronomy) 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 かつ has now been reclassified as a dwarf planet.) [from 17thc.]
- 1640, John Wilkins, A Discovrse concerning a New Planet. Tending to prove, That 'tis probable our Earth is one of the Planets, title:
- A Discovrse concerning a New Planet. Tending to prove, That 'tis probable our Earth is one of the Planets
- A large body which directly orbits any star (または star cluster) but which has not attained nuclear fusion.
- In phrases such as the planet, this planet, sometimes refers to the Earth.
- 1907 August, Robert W[illiam] Chambers, chapter VIII, in The Younger Set, New York, N.Y.: D. Appleton & Company, OCLC 24962326:
- "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; […]."
使用する際の注意点
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.
上位語
下位語
- binary planet
- Blue Planet
- carbide planet
- carbon planet
- classical planet
- diamond planet
- double planet
- dual planet
- dwarf planet (structurally)
- exoplanet
- extrasolar planet
- free-floating planet
- giant planet
- inner planet
- interstellar planet
- major planet
- mesoplanet
- minor planet (structurally)
- outer planet
- Planet Earth
- primary planet
- Red Planet
- rogue planet
- satellite planet
- satellite planet
- silicon planet
- supergiant planet
- superplanet
- terrestrial planet
- water planet
派生語
関連する語
参考
参照
- planet on Wikipedia.
- First Steps to Astronomy and Geography, 1828, (Hatchard & Son: Piccadilly, London).
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planetのページの著作権
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Text is available under Creative Commons Attribution-ShareAlike (CC-BY-SA) and/or GNU Free Documentation License (GFDL). Weblio英和・和英辞典に掲載されている「Wiktionary英語版」の記事は、Wiktionaryのplanet (改訂履歴)の記事を複製、再配布したものにあたり、Creative Commons Attribution-ShareAlike (CC-BY-SA)もしくはGNU Free Documentation Licenseというライセンスの下で提供されています。 |
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