meridian

A meridian is an imaginary line that runs from the North Pole to the South Pole on the Earth's surface. These lines help us measure longitude, which indicates a location’s east-west position. When you think of a meridian, imagine it like the longitudinal lines on a globe, dividing Earth into slices. The most notable meridian is the Prime Meridian, which passes through Greenwich, England, and is used as the starting point for measuring longitudes. Meridians are essential for navigation, mapping, and understanding geographic locations worldwide.