- 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.
Origin of galactic equator
First recorded in 1885–90
Also called galactic circle.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- the great circle on the celestial sphere containing the galactic plane
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012