What is the name of the earth's zero of longitude that passes through Greenwich, England?

The Prime Meridian is the earth's line of zero longitude, which runs through Greenwich, England. This meridian is significant because it serves as the reference point for all other longitudes, which are measured in degrees east or west of this line. The Prime Meridian is essential for navigation and mapping, as it helps establish the global coordinate system used to determine the location of points on the Earth's surface.

In contrast, the Equator refers to the line of zero latitude, which separates the northern and southern hemispheres. The International Date Line is an imaginary line on the opposite side of the globe from the Prime Meridian where the date changes, and the Tropic of Cancer marks the northernmost point at which the sun can be directly overhead at noon. Understanding the Prime Meridian's role highlights its importance in global geography and timekeeping.