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noun, Astronomy.
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.
the great circle on the celestial sphere containing the galactic plane


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  • Galactic-latitude

    noun, Astronomy. 1. the angular distance from the galactic equator of a point on the celestial sphere.

  • Galactic-longitude

    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.

  • Galactic-nebula

    noun, Astronomy. 1. a nebula in the Milky Way.

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