longitude definition angle
The demarcation of the longitude coordinate is done with lines going up and down are called the meridians. A figure to the right shows a few meridians. Longitude ranges from 0Â° to 180Â° East and 0Â° to 180Â° West. The longitude angle is measured from the center of the earth as shown in the earth graphic to the right. The zero point of longitude is defined as a point in Greenwich, England called the Prime Meridian.