galactic longitude

galactic longitude

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.

Origin:
1910–15
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Galactic longitude is always a great word to know.
So is altitude. Does it mean:
a low-mass star that emits low to average amounts of light that burn their hydrogen slowly over a long life span
the angular distance of a heavenly body above the horizon
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