"As far as the east is from the west"...keep going east, the west never comes...keep going west, the east never comes. There is no edge and you're going in a circle around the imaginary line that connects the north and south poles together. A circle's (with diameter = 1) circumference is the number pi, which has no end to it.

"As far as the east is from the west"...keep going east, the west never comes...keep going west, the east never comes. There is no edge and you're going in a circle around the imaginary line that connects the north and south poles together. A circle's circumference is the number pi, which has no end to it.