Score Big on HISET Social Studies 2026 – Challenge Yourself and Win!

The Prime Meridian is significant as it serves as the reference line for establishing 0 degrees longitude. This means it is the baseline from which all other longitudes are measured, facilitating navigation and geographical orientation. It runs through Greenwich, England, and its location is crucial for global positioning systems and for establishing time zones, which are based on longitudinal divisions. By defining 0 degrees longitude, the Prime Meridian plays a fundamental role in cartography and geography, helping to create a standardized framework for understanding global geography.