Cardinal direction
The four cardinal directions or cardinal points are the four main compass directions: north, east, south, and west. The corresponding azimuths are 0°, 90°, 180°, and 270°.
The four ordinal directions or intercardinal directions are northeast, southeast, southwest, and northwest.
The corresponding azimuths are 45°, 135°, 225°, and 315°.
The intermediate direction of every pair of neighboring cardinal and intercardinal directions is called a secondary intercardinal direction. These eight shortest points in the compass rose shown to the right are:
- West-northwest
- North-northwest
- North-northeast
- East-northeast
- East-southeast
- South-southeast
- South-southwest
- West-southwest
Determination
Additional points
Azimuth
The directional names are routinely associated with azimuths, the angle of rotation in the unit circle over the horizontal plane. It is a necessary step for navigational calculations and for use with Global Positioning System receivers. The four cardinal directions correspond to the following degrees of a compass:- North : 0° = 360°
- East : 90°
- South : 180°
- West : 270°
Intercardinal directions
- Northeast, 45°, halfway between north and east, is the opposite of southwest.
- Southeast, 135°, halfway between south and east, is the opposite of northwest.
- Southwest, 225°, halfway between south and west, is the opposite of northeast.
- Northwest, 315°, halfway between north and west, is the opposite of southeast.
Subintercardinal directions
Beyond geography
Cardinal directions or cardinal points may sometimes be extended to include vertical position : north and south, east and west, up and down; or mathematically the six directions of the x-, y-, and z-axes in three-dimensional Cartesian coordinates. Topographic maps include elevation, typically via contour lines.Alternatively, elevation angle may be combined with cardinal direction to form a local spherical coordinate system.
In astronomy
In astronomy, the cardinal points of an astronomical body as seen in the sky are four points defined by the directions toward which the celestial poles lie relative to the center of the disk of the object in the sky.A line from the center of the disk to the North celestial pole will intersect the edge of the body at the North point. The North point will then be the point on the limb that is closest to the North celestial pole. Similarly, a line from the center to the South celestial pole will define the South point by its intersection with the limb. The points at right angles to the North and South points are the East and West points. Going around the disk clockwise from the North point, one encounters in order the West point, the South point, and then the East point. This is opposite to the order on a terrestrial map because one is looking up instead of down.
Similarly, when describing the location of one astronomical object relative to another, "north" means closer to the North celestial pole, "east" means at a higher right ascension, "south" means closer to the South celestial pole, and "west" means at a lower right ascension. If one is looking at two stars that are below the North Star, for example, the one that is "east" will actually be further to the left.
Germanic origin of names
During the Migration Period, the Germanic names for the cardinal directions entered the Romance languages, where they replaced the Latin names borealis with north, australis with south, occidentalis with west and orientalis with east. It is possible that some northern people used the Germanic names for the intermediate directions. Medieval Scandinavian orientation would thus have involved a 45 degree rotation of cardinal directions.- north from the proto-Indo-European *nórto-s 'submerged' from the root *ner- 'left, below, to the left of the rising sun' whence comes the Ancient Greek name Nereus.
- east from the word for dawn. The proto-Indo-European form is *austo-s from the root *aues- 'shine '. See Ēostre.
- south, derived from proto-Indo-European *sú-n-to-s from the root *seu- 'seethe, boil'. Cognate with this root is the word Sun, thus "the region of the Sun".
- west from a word for "evening". The proto-Indo-European form is *uestos from the root *ues- 'shine ', itself a form of *aues-. Cognate with the root are the Latin words vesper and vesta and the Ancient Greek Hestia, Hesperus and Hesperides.
Cultural variations
In pre-modern Europe more generally, between eight and 32 points of the compass – cardinal and intercardinal directions – were given names. These often corresponded to the directional winds of the Mediterranean Sea.
Particular colors are associated in some traditions with the cardinal points. These are typically "natural colors" of human perception rather than optical primary colors.
Many cultures, especially in Asia, include the center as a fifth cardinal point.
Northern Eurasia
| Northern Eurasia | N | E | S | W | C | Source |
| Slavic | — | |||||
| China | ||||||
| Ainu | ||||||
| Turkic | ||||||
| Kalmyks | — | |||||
| Tibet |
Central Asian, Eastern European and North East Asian cultures frequently have traditions associating colors with four or five cardinal points.
Systems with five cardinal points include those from pre-modern China, as well as traditional Turkic, Tibetan and Ainu cultures. In Chinese tradition, the five cardinal point system is related to I Ching, the Wu Xing and the five naked-eye planets. In traditional Chinese astrology, the zodiacal belt is divided into the four constellation groups corresponding to the directions.
Each direction is often identified with a color, and with a mythological creature of that color. Geographical or ethnic terms may contain the name of the color instead of the name of the corresponding direction.
Examples
East: Green/Blue ; Spring; WoodSouth: Red; Summer; Fire
West: White; Autumn; Metal
North: Black; Winter; Water
Center: Yellow; Earth
Arabic world
Countries where Arabic is used refer to the cardinal directions as الشَّمَال , الشَّرْق , الْجَنُوب , and الْغَرْب . Additionally, الْوَسَط al-wasaṭ is used for the center. All five are used for geographic subdivision names, and some are the origin of some Southern Iberian place names.North America
In Mesoamerica and North America, a number of traditional indigenous cosmologies include four cardinal directions and a center. Some may also include "above" and "below" as directions, and therefore focus on a cosmology of seven directions. For example, among the Hopi of the Southwestern United States, the four named cardinal directions are not North, South, East and West but are the four directions associated with the places of sunrise and sunset at the winter and summer solstices. Each direction may be associated with a color, which can vary widely between nations, but which is usually one of the basic colors found in nature and natural pigments, such as black, red, white, and yellow, with occasional appearances of blue, green, or other hues. There can be great variety in color symbolism, even among cultures that are close neighbors geographically.India
Ten Hindu deities, known as the "Dikpālas", have been recognized in classical Indian scriptures, symbolizing the four cardinal and four intercardinal directions with the additional directions of up and down. Each of the ten directions has its own name in Sanskrit.Indigenous Australia
Some indigenous Australians have cardinal directions deeply embedded in their culture. For example, the Warlpiri people have a cultural philosophy deeply connected to the four cardinal directions and the Guugu Yimithirr people use cardinal directions rather than relative direction even when indicating the position of an object close to their body.The precise direction of the cardinal points appears to be important in Aboriginal stone arrangements.
Many aboriginal languages contain words for the usual four cardinal directions, but some contain words for 5 or even 6 cardinal directions.
Unique (non-compound) names of intercardinal directions
In some languages, such as Estonian, Finnish and Breton, the intercardinal directions have names that are not compounds of the names of the cardinal directions. In Estonian, those are kirre, kagu, edel, and loe, in Finnish koillinen, kaakko, lounas, and luode. In Japanese, there is the interesting situation that native Japanese words are used for the cardinal directions, but borrowed Chinese words are used for intercardinal directions. In the Malay language, adding laut to either east or west results in northeast or northwest, respectively, whereas adding daya to west results in southwest. Southeast has a special word: tenggara.Sanskrit and other Indian languages that borrow from it use the names of the gods associated with each direction: east, southeast, south, southwest, west, northwest, north and northeast. North is associated with the Himalayas and heaven while the south is associated with the underworld or land of the fathers. The directions are named by adding "disha" to the names of each god or entity: e.g. Indradisha or Pitrdisha.
The cardinal directions of the Hopi language are related to the places of sunrise and sunset at the solstices, and correspond approximately to the European intercardinal directions.