The Geocentric theory is the out of date idea that the sun, the moon, the planets and the stars all revolve round the Earth. Geocentrism is connected with the Ancient Greek Philosopher,Pholemy and was widely accepted in the Ancient world up to the end of the Mediaeval era. By this notion of course the Earth isn't a planet and the sun isn't a star. At least those who accept the Geocentrictheory accept that the Earth isn't flat.