What is the name of the imaginary line that separates the Eastern and Western Hemispheres?

The Prime Meridian is the imaginary line that serves as the dividing line between the Eastern and Western Hemispheres. It is designated at 0 degrees longitude and runs from the North Pole to the South Pole, passing through Greenwich, London. This line is crucial for geographical and navigational purposes, as it provides a reference point for measuring longitude. By establishing the Prime Meridian, we can accurately map locations in relation to east or west, making it fundamental in the global coordinate system.

The Equator, while important for dividing the Earth into the Northern and Southern Hemispheres, does not separate the Eastern and Western Hemispheres. The Tropic of Cancer is a circle of latitude that marks the northernmost point where the sun can be directly overhead, but it is not related to the division of hemispheres. The International Date Line, although it has a role in timekeeping and indicates where each day officially begins, is not responsible for separating the hemispheres.