The zero-degree line of longitude, an imaginary line circling the Earth, serves as the reference point for measuring distances east and west. It is the arbitrary starting point for the world’s time zones and the basis for establishing standard time. Located at 0 longitude, this line passes through Greenwich, England, by international agreement. Any location east or west of this line is designated with a longitudinal coordinate, measured in degrees, minutes, and seconds, up to 180 degrees.
Its adoption as the standard greatly facilitated navigation and international trade, creating a consistent and universally recognized system for determining location. Historically, various countries used different reference lines, which led to confusion and difficulty in mapmaking and communication. The establishment of this standard eliminated these discrepancies and provided a stable foundation for global spatial understanding. It is also central to understanding the concept of time zones and how they relate to the Earths rotation.
