A meridian is an imaginary north-south line that runs along the Earth's surface from the North Pole to the South Pole. Unlike latitude lines, which are parallel to one another and vary in length, all meridians are equal in length and intersect at the poles.
The Prime Meridian passes through the Royal Observatory in Greenwich, England. Value: It is designated as 0° longitude.
Understanding Meridian Coordinates: The Earth’s Vertical Blueprint meridian coordinates
This is why time zones are generally spaced 15 degrees apart. When you cross a meridian line roughly every 15°, you move into a different hour of the day. This connection is why "meridian" is also a temporal term— Ante Meridiem (A.M.) means "before the meridian" (noon), and Post Meridiem (P.M.) means "after the meridian." Practical Applications Today
When we look at a map or use a GPS, we often take for granted the invisible grid that helps us pinpoint our exact location on Earth. While latitude lines (parallels) circle the globe horizontally, —better known as longitude—provide the vertical framework necessary for global navigation, timekeeping, and mapping. What are Meridian Coordinates? A meridian is an imaginary north-south line that
Pilots and captains use these coordinates to chart courses over featureless oceans and skies.
Meridian coordinates aren't just for location; they are the foundation of our global time system. Because the Earth rotates 360° every 24 hours, it moves approximately . Value: It is designated as 0° longitude
While the concept is centuries old, meridian coordinates are more relevant today than ever:
When we talk about meridian coordinates, we are measuring : the angular distance of a place east or west of a specific reference line. This distance is measured in degrees, minutes, and seconds. The Prime Meridian: The Starting Point