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galactic longitude

See more synonyms for galactic longitude on Thesaurus.com
noun Astronomy.
  1. the angular distance in degrees measured eastward in the galactic plane from a radius drawn from the earth as center to the constellation Sagittarius.
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Origin of galactic longitude

First recorded in 1910–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018