Talk:Celestia/@comment-99.109.10.170-20111028041108/@comment-4531340-20111028042133

It says she is the co-ruler because in the first two episodes of the series, her sister is purified from the monster Night Mare Moon back into Princess Luna, who takes her rightful place on Equestria's throne beside Celestia. And now, she's back to only having to deal with the sun, since Luna handles the moon and the stars once again.