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galactic equator

noun

, Astronomy.
  1. the great circle on the celestial sphere that is equidistant from the galactic poles, being inclined approximately 62° to the celestial equator and lying about one degree north of the center line of the Milky Way.

galactic equator

noun

  1. the great circle on the celestial sphere containing the galactic plane

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Word History and Origins

Origin of galactic equator1

First recorded in 1885–90

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