The imaginary line that divides the Earth into Eastern and Western Hemispheres is called the Prime Meridian. Located at 0 degrees longitude, the Prime Meridian runs from the North Pole to the South Pole and passes through Greenwich, England. It serves as a reference point for measuring longitude, enabling the global system of time zones. The concept of dividing the Earth into hemispheres helps geographers and scientists communicate and understand the planet’s geography and navigation. In conjunction with the International Date Line situated at approximately 180 degrees longitude, the Prime Meridian plays a critical role in global navigation and mapping.