Greenwich, England is known as the location of which significant geographical marker?

Greenwich, England is recognized as the location of the Prime Meridian, an important geographical marker that represents 0 degrees longitude. The Prime Meridian is the starting point for the measurement of longitude and serves as the reference line from which all other longitudes are calculated. This means that any point east or west of the Prime Meridian is measured in degrees away from it. The establishment of the Prime Meridian at Greenwich in 1884 was significant for navigation and timekeeping, as it helped standardize time zones and provided a consistent frame of reference for determining time and location across the globe. This is why Greenwich is regarded as a pivotal point in geographical terms, where east meets west.