The celestial equator, in conjunction with the Great Rift, defined a border of the Outlands Region.
The original film's screenplay contained the celestial equator in the opening crawl of its first two drafts, as well as the rough draft. However, it was removed in the third draft.
Within our own reality, the galactic equator serves as the midpoint of the galactic plane, dividing the galaxy into two sections. It's utilized within the galactic coordinate system to represent 0 degrees of latitude.