galactic longitude

American

noun

Astronomy.

the angular distance in degrees measured eastward in the galactic plane from a radius drawn from the earth as center to the constellation Sagittarius.

Etymology

Origin of galactic longitude

First recorded in 1910–15

Example Sentences

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galactic longitude

The fourth column gives the galactic square, the fifth and sixth columns the galactic longitude and latitude.

From Lectures on Stellar Statistics by Charlier, Carl Vilhelm Ludvig

Instead of giving the galactic longitude and latitude of a star we may content ourselves with giving the galactic square in which the star is situated.

From Lectures on Stellar Statistics by Charlier, Carl Vilhelm Ludvig

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023