The mean plane of our Galaxy, marked by the band of the Milky Way. It is defined by specifying the positions of the galactic poles. See alsogalactic equator.
Space Exploration
The plane passing through the Sun and the centre of our Galaxy defining the mid-plane of the galactic disc. Viewed from the Earth, the galactic plane is a great circle (galactic equator) marking the approximate centre line of the Milky Way.