What two lines seperate eastern and western hemisphere?
The eastern and western hemispheres are separated by a single continuous line which passes through the geographical north and south poles. On the one side of the earth, it is the 0, or Greenwich, Meridian and, on the other (Pacific) side, it is the 180 meridian (which should not be confused with the International Date Line – though this approximates to the 180 meridian, it zig-zags across it repeatedly, at the behest of political convenience).
