The Antichthon (Counter-Earth or Gloria) is a hypothetical body of the Solar system hypothesized by the pre-Socratic Greek philosopher Philolaus (c. 470 – c. 385 BC) to support his non-geocentriccosmology, in which all objects in the universe revolve around an unseen "Central Fire" (distinct from the Sun which also revolves around it).
(THe central fire is the Sun, but the people thought the Sun orbited the MIGHTY COOL GREAT STRONG POWERFUL ALLMIGHTY EARTH... so... the central fire is idon'tevenknowwhatiteqaulstoastaroragalaxyidon'tknow)