Cardinal direction
Four main compass directions used for navigation and orientation.
Cardinal directions are the four primary compass points: north, east, south, and west. These correspond to azimuth angles of 0° (or 360°), 90°, 180°, and 270°, respectively, measured clockwise from north. The four intercardinal, or ordinal, directions—northeast, southeast, southwest, and northwest—lie halfway between each pair of cardinal points, with azimuths of 45°, 135°, 225°, and 315°. Further subdivision yields eight secondary intercardinal directions (such as north-northeast and west-southwest), creating a total of 16 evenly spaced named points. Even finer divisions, like north by east, produce a 32-point compass. Beyond geography, the concept of cardinal directions can be extended to include vertical axes (up and down), forming the six directions of three-dimensional Cartesian coordinates. In astronomy, the cardinal points of a celestial body are defined by the intersection of its limb with lines drawn to the celestial poles; the order of points around the disk (North, West, South, East) is reversed compared to terrestrial maps because the observer looks upward. The Germanic names for these directions entered Romance languages during the Migration Period, replacing Latin terms. The word "north" derives from a Proto-Indo-European root meaning "left" or "below," referring to the left of the rising sun. "East" comes from a root for "dawn," "south" from a root meaning "seethe" or "boil," linked to the Sun, and "west" from a root for "evening." Many cultures associate seasonal prevailing winds with specific cardinal and intercardinal directions, as seen in classical Greek traditions.
- cardinal_directions
- North, East, South, West
- intercardinal_directions
- NE, SE, SW, NW
- secondary_intercardinal_count
- 8
- total_named_points
- Up to 32
- associated_fields
- Navigation, geography, astronomy, culture
Lore & Background
Secondary intercardinal directions, such as north-northeast and west-southwest, further subdivide the compass into 16 named points. These eight points are the shortest divisions on a standard compass rose, lying between each cardinal and intercardinal direction. Beyond these, tertiary intercardinal directions yield a total of 32 named points evenly spaced around the compass, including terms like 'north by east' and 'northeast by north'. The directional names are routinely associated with azimuths—angles of rotation in degrees on the horizontal plane—which are essential for navigational calculations and use with GPS receivers. The four cardinal directions correspond to specific degrees: north at 0° (or 360°), east at 90°, south at 180°, and west at 270°. The intercardinal directions lie halfway between each pair of cardinal points: northeast at 45°, southeast at 135°, southwest at 225°, and northwest at 315°. Historically, during the Migration Period, Germanic names for cardinal directions replaced Latin terms in Romance languages. The Germanic word for north derives from a Proto-Indo-European root meaning 'submerged' or 'left', while east comes from a root for 'dawn', south from a root meaning 'seethe' (cognate with 'Sun'), and west from a root for 'evening'. In astronomy, cardinal points on a celestial body are defined by lines from its center to the celestial poles, with east and west at right angles to north and south; the order around the disk is opposite to that on a terrestrial map because one looks upward rather than downward.
Reader's Guide
Cardinal directions are fundamental to navigation, used in conjunction with azimuths for calculations in trigonometry and GPS receivers. Beyond geography, they extend to vertical positions (up/down) and three-dimensional Cartesian coordinates. In astronomy, cardinal points on celestial bodies are defined relative to the celestial poles, with east and west reversed compared to terrestrial maps due to the observer's perspective. Culturally, many traditions associate colors with cardinal directions—for example, in Chinese tradition, east is green/blue, south is red, west is white, north is black, and center is yellow. Germanic names for cardinal directions replaced Latin terms during the Migration Period, and in pre-modern Europe, winds were often named after these directions. The Arabic world uses terms like aš-šamāl (north) and aš-šarq (east), while indigenous North American cosmologies sometimes include seven directions (four cardinal, center, above, below).
Did You Know?
- Secondary intercardinal directions include west-northwest, north-northeast, and east-southeast.
- In astronomy, the order of cardinal points on a celestial body is North, West, South, East when viewed clockwise.
- The Germanic word 'north' derives from Proto-Indo-European *nórto-s, meaning 'submerged'.
Frequently Asked Questions
What are Cardinal directions in the Maps & Their Symbols system?
They are the four primary compass points—North, East, South, and West—that serve as the foundational reference for all navigation and orientation on any map.
How do Cardinal directions relate to the Intercardinal points?
The four intercardinal directions (NE, SE, SW, NW) sit exactly halfway between each adjacent pair of Cardinals, splitting the full circle into eight equal sectors.
Why are Cardinal directions considered essential in maps, navigation, and related fields?
They provide the universal baseline for orientation, which is why they underpin navigation, geography, astronomy, and even cultural references to direction around the world.
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