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galactic coordinate

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noun Astronomy.
  1. Usually galactic coordinates. a member of a system of coordinates that define the position of a celestial body with reference to the Milky Way.
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See also galactic latitude, galactic longitude

Origin of galactic coordinate

First recorded in 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018