Hemisphere (from Ancient Greek ἡμισφαίριον - hēmisphairion "half of a sphere") may refer to: Half of a sphere As half of the Earth: Any half of the Earth or other planetary or stellar body Western Hemisphere Eastern Hemisphere Northern Hemisphere Southern Hemisphere Land hemisphere Water hemisphere Any half of the (Earth-centered) celestial sphere cultural hemisphere Western world Eastern world New World Old World As half… (More on Hemisphere)