galactic equator

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galactic equator

n.
The great circle of the celestial sphere that lies in the plane bisecting the band of the Milky Way galaxy, inclined at an angle of approximately 62° to the celestial equator. Also called galactic circle.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

galactic equator

or

galactic circle

n
(Astronomy) the great circle on the celestial sphere containing the galactic plane
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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