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
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
First Known Use of galactic longitude
Seen and Heard
What made you want to look up galactic longitude? Please tell us where you read or heard it (including the quote, if possible).