Fixed-star meaning

A star or nebula that appears to remain in constant position relative to other celestial bodies, in contrast with celestial bodies such as the planets in our solar system, whose changes in position relative to the stars are readily observable by telescope or the unaided eye. All stars except the sun are considered fixed stars.
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A star or other celestial object so distant from Earth that its position in relation to other stars appears not to change over time. The fixed stars, which include virtually all visible objects beyond the solar system, form the background against which the motions of the Sun, planets, and other bodies of the solar system are measured, and they provide the reference for determining sidereal time. In actuality, no celestial object has a fixed position in relation to any other, and the movement of so-called fixed stars can be measured by precise observation over long periods of time.
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(astronomy) Any star that is so distant that its movement, relative to others, is not perceptible; in practice, any star except the sun.
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Origin of fixed-star

  • From earlier fixed star (“comet, meteor”), alteration of faxed star. Change in meaning influenced by fixed (“stationary, remaining in place”).
    From Wiktionary