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Cardinal direction

geography Maturity 7-9 Next article →

Cardinal directions are the primary points used to define position and orientation. These points allow us to map the world and navigate through space. The most fundamental points are the four cardinal directions: North (N), East (E), South (S), and West (W).

Brosen windrose
Brosen windrose

These points are often used alongside azimuths to provide exact locations. An azimuth is the angle of rotation measured in degrees. This measurement is taken on a horizontal plane within a unit circle. Using azimuths is a necessary step for complex navigational calculations. It is also required for the operation of Global Positioning System (GPS) receivers.

To navigate with precision, we use a system of increasingly specific directions. The four intercardinal directions, also called ordinal directions, sit halfway between the cardinal points. These include Northeast (NE), Southeast (SE), Southwest (SW), and Northwest (NW). For example, Northeast is located at 45 degrees. If we add more points, we find secondary intercardinal directions. These eight points result in a total of 16 named points on a compass rose. There are even tertiary intercardinal directions, which create 32 evenly spaced points. These include names like North-northeast (NNE) or East-by-north (EbN).

Ilmakaared+ilmansuunnat
Ilmakaared+ilmansuunnat

Each cardinal direction can be assigned a specific degree value. North is defined as 0 degrees or 360 degrees. East is located at 90 degrees. South corresponds to 180 degrees. West is found at 270 degrees. These numbers allow for mathematical precision in geography. In three-dimensional math, these directions relate to the x-, y-, and z-axes. This concept is known as Cartesian coordinates. In some cases, directions are extended to include vertical positions like elevation or depth. Topographic maps use contour lines to show this elevation.

The names we use today have a deep linguistic history. During the Migration Period, Germanic names for directions entered Romance languages. These names replaced the older Latin terms. For example, the Latin words *borealis* and *septentrionalis* were replaced by "North." The Latin *australis* and *meridionalis* were replaced by "South." The word for East comes from a root meaning "dawn." The word for West comes from a root meaning "evening." Even the word North is linked to an ancient term meaning "left" or "below" the rising sun.

Many global cultures associate directions with specific colors and elements. In China, a five-point system includes the four directions and a center. Each direction is linked to a color and a mythological creature. North is associated with black, water, and winter. East is linked to green or blue, wood, and spring. South is connected to red, fire, and summer. West is tied to white, metal, and autumn. The center is often associated with yellow and earth. This system is related to concepts like the Wu Xing and the I Ching.

Other cultures have unique ways of viewing direction and space. In India, classical scriptures recognize ten directions. These include the four cardinal points, the four intercardinal points, and the directions up and down. In Mesoamerica, indigenous cosmologies often focus on seven directions, including "above" and "below." The Hopi people associate directions with the sunrise and sunset during solstices. In Australia, some groups like the Guugu Yimithirr use cardinal directions for everything. They use them even to describe the position of objects close to their own bodies.

Astronomers also use cardinal points, but they apply them to objects in the sky. They define these points based on the celestial poles. A line drawn from the center of an object to the North celestial pole hits the edge, or the "limb," at the North point. The South point is found similarly. The East and West points sit at right angles to these. Interestingly, the order of points in the sky is different from a map. When looking up, the order is North, West, South, and then East. This happens because astronomers are looking up rather than down at the ground.

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Ilmakaared+ilmansuunnat.svg
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