The Earth is wrapped in an invisible grid of lines known as latitude and longitude. While latitude tells us how far north or south we are from the Equator, longitude determines our east-west position. At the heart of this system lie two critical, opposing lines: the and the Antimeridian . Together, they form a great circle that divides the Earth into the Eastern and Western Hemispheres. The Prime Meridian: The Starting Point (0°)
The starting point for measuring longitude. It runs through Greenwich, London , UK, and divides Earth into Eastern Hemisphere (0° to 180° east) and Western Hemisphere (0° to 180° west). antimeridian and prime meridian