Meridians Of — Longitudes
The primary practical purpose of meridians is the calculation of time. Because the Earth rotates 360 degrees in 24 hours, it rotates 15 degrees every hour. Therefore, Earth is divided into 24 standard time zones, each theoretically spanning 15 degrees of longitude.
They run north-south but measure distance east-west . meridians of longitudes
Areas 0° to 180° west of Greenwich (covering the Americas and the Atlantic). Longitude and the Mystery of Time The primary practical purpose of meridians is the
