galactic longitude


Definition of galactic longitude

: longitude in the system of galactic coordinates measured in degrees eastward from the point where the galactic equator crosses the celestial equator in the constellation Aquila

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First Known Use of galactic longitude

1872, in the meaning defined above

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The first known use of galactic longitude was in 1872

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Cite this Entry

“Galactic longitude.” The Dictionary, Merriam-Webster Inc., Accessed 12 December 2019.

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