A meridian coordinate, commonly referred to as , is a geographic coordinate that specifies the east-west position of a point on the Earth's surface.
Longitude is measured from 0° at the Prime Meridian to 180° both East and West.
The meridian system is one of the world's oldest medical models, with roots stretching back over two millennia. The foundational text, the , describes a system of meridians and points that has guided acupuncture practice for more than 2,000 years . meridian coordinates
This traditional format breaks degrees down into smaller units for precision. One degree contains 60 minutes ('), and one minute contains 60 seconds ("). Example: 74° 00' 21" W (New York City) 2. Degrees and Decimal Minutes (DDM) Commonly used in marine navigation and aviation. Example: 40° 42.883' N, 74° 00.350' W 3. Decimal Degrees (DD)
Airplanes and ships rely on coordinate routing to safely traverse oceans where ground-based landmarks do not exist. Autopilots use waypoint networks defined by precise meridian and parallel intersections. This ensures fuel efficiency and prevents mid-air or mid-ocean collisions. Geographic Information Systems (GIS) A meridian coordinate, commonly referred to as ,
Meridian coordinates have a wide range of applications across various fields:
The concept of meridian coordinates isn't just about finding a spot on a map; it’s the foundation of how we track time. 1. Time Zones The foundational text, the , describes a system
are the imaginary vertical lines on Earth—also called lines of longitude—that run from the North Pole to the South Pole. They are used alongside latitude to create a global address system, allowing anyone to pinpoint an absolute location on the planet's surface. Unlike parallels of latitude, meridians are not parallel; they are widest at the equator and converge until they meet at the poles. Key Components of Meridian Coordinates
A star’s position is described using two "meridian coordinates" in the :