Meridian | Coordinates

Extends up to 180° West (-180°) of the Prime Meridian.

At dawn, the surveyor Lina stood on the ridge where two worlds met: the map’s neat grid and the breathing, shifting earth. In her palm she balanced a weathered brass compass and a folded chart marked with meridian coordinates — lines drawn by centuries of navigators to tame the globe’s roundness into directions.

To facilitate research and international education, acupoints are increasingly described in metric terms using anatomical reference points. For instance, computed tomography (CT) studies have shown that is located at a mean distance of 3.49 ± 0.58 cm from the vertebral line, while BL26 is located 3.32 ± 0.53 cm from the midline . The WHO and national standards (e.g., GB/T 12346-2021) provide both traditional and metric descriptions .

: The Statue of Liberty is located at approximately 74° 02' 40" W. 2. Decimal Degrees (DD) meridian coordinates

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meridian. This line sits in the middle of the Pacific Ocean and serves as the baseline for the International Date Line.

The Ultimate Guide to Meridian Coordinates: Mapping the Earth’s Longitude Extends up to 180° West (-180°) of the Prime Meridian

Example: A location at 74° West is expressed digitally as -74.0000°. The Variable Distance of a Degree

Positive values represent the Northern and Eastern hemispheres. : The Statue of Liberty is located at

Meridian coordinates, commonly referred to as lines of longitude, are imaginary semi-ellipses running vertically from the North Pole to the South Pole. Unlike lines of latitude, which run parallel to each other and vary in circumference, all meridians are of equal length and converge at the poles.

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)

Today, we no longer look through sextants or wind mechanical chronometers, but meridian coordinates remain vital to modern society. Global Positioning System (GPS)

The concept of meridian coordinates dates back to ancient civilizations, with evidence of its use found in the works of Greek philosophers such as Eratosthenes and Hipparchus. However, it wasn't until the 16th century that the modern system of longitude and latitude was developed.