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Perhaps it is from a nasalized form of Proto-Indo-European*pleh₂-(“flat, broad”) on the notion of "spread out", "but the semantics are highly problematic", according to Beekes, who notes the similarity of meaning to πλάζω(plázō, “to make devious, repel, dissuade from the right path, bewilder”), but adds, "it is hard to think of a formal connection".
So called because they have apparent motion, unlike the "fixed" stars. Originally including also the moon and sun but not the Earth; modern scientific sense of "world that orbits a star" is from 1630s in English. The Greek word is an enlarged form of πλάνης(plánēs, “who wanders around, wanderer”), also "wandering star, planet", in medicine "unstable temperature."
Be they not dreames of humane vanity,[…]to make of our knowne earth a bright shining planet[translating astre]?
1749, Henry Fielding, Tom Jones, Folio Society, published 1973, page 288:
The moon[…]began 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, Keith Thomas, Religion and the Decline of Magic, Folio Society, published 2012, page 361:
Another of Boehme's followers, the Welshman Morgan Llwyd, also believed that the seven planets could be found within man.
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
2006 December 22, Alok Jha, The Guardian:
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.
2009 December 1st, Keiichi Wada, Yusuke Tsukamoto, Eiichiro Kokubo, “Planet Formation around Supermassive Black Holes in the Active Galactic Nuclei”, in The Astrophysical Journal, volume 886, number 2, article 107:
"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;[…]."
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]:[…]; perhaps to moralise on the oneness or fragility of the planet, or to see humanity for the small and circumscribed thing that it is;[…].
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 Galilean satellites of Jupiter were at first called planets (satellite planets), but later reclassified along with the Moon. The first asteroids were also considered 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 number of astronomers reject the IAU definition, especially in the field of planetary geology. Some are of the opinion that orbital parameters should be irrelevant, and that either any equilibrium (ellipsoidal) body in direct orbit around a star is a planet (there are likely at least a dozen such bodies in the Solar system) or that any equilibrium body at all is a planet, thus re-accepting the Moon, the Galilean satellites and other large moons as planets, as well as rogue planets.
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