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  2. Circle of latitude - Wikipedia

    en.wikipedia.org/wiki/Circle_of_latitude

    The latitude of the circle is approximately the angle between the Equator and the circle, with the angle's vertex at Earth's centre. The Equator is at 0°, and the North Pole and South Pole are at 90° north and 90° south, respectively. The Equator is the longest circle of latitude and is the only circle of latitude which also is a great circle.

  3. List of circles of latitude - Wikipedia

    en.wikipedia.org/wiki/List_of_circles_of_latitude

    The equator, a circle of latitude that divides a spheroid, such as Earth, into the northern and southern hemispheres. On Earth, it is an imaginary line located at 0 degrees latitude . 0°

  4. Arctic Circle - Wikipedia

    en.wikipedia.org/wiki/Arctic_Circle

    The Arctic Circle, roughly 67° north of the Equator, defines the boundary of the Arctic waters and lands. The Arctic Circle is one of the two polar circles, and the most northerly of the five major circles of latitude as shown on maps of Earth at about 66° 34' N. [1] Its southern equivalent is the Antarctic Circle.

  5. Polar circle - Wikipedia

    en.wikipedia.org/wiki/Polar_circle

    On Earth, the Arctic Circle is currently drifting northwards at a speed of about 14.5 m per year and is now at a mean latitude (i.e. without taking into account the astronomical nutation) of 66°33′50.2″ N; the Antarctic Circle is currently drifting southwards at a speed of about 14.5 m per year and is now at a mean latitude of 66°33′50. ...

  6. Longitude - Wikipedia

    en.wikipedia.org/wiki/Longitude

    The length of a degree of longitude (east–west distance) depends only on the radius of a circle of latitude. For a sphere of radius a that radius at latitude φ is a cos φ, and the length of a one-degree (or ⁠ π / 180 ⁠ radian) arc along a circle of latitude is

  7. Tropic of Cancer - Wikipedia

    en.wikipedia.org/wiki/Tropic_of_Cancer

    The circle's position was at exactly 23° 27′N in 1917 and will be at 23° 26'N in 2045. [3] The distance between the Antarctic Circle and the Tropic of Cancer is essentially constant as they move in tandem. This is based on an assumption of a constant equator, but the precise location of the equator is not truly fixed.

  8. Tropic of Capricorn - Wikipedia

    en.wikipedia.org/wiki/Tropic_of_Capricorn

    The Tropic of Capricorn is one of the five major circles of latitude marked on maps of Earth. Its latitude is currently 23°26′09.8″ (or 23.43605°) [1] south of the Equator, but it is very gradually moving northward, currently at the rate of 0.47 arcseconds, or 15 metres, per year.

  9. Latitude - Wikipedia

    en.wikipedia.org/wiki/Latitude

    The Equator has a latitude of 0°, the North Pole has a latitude of 90° North (written 90° N or +90°), and the South Pole has a latitude of 90° South (written 90° S or −90°). The latitude of an arbitrary point is the angle between the equatorial plane and the normal to the surface at that point: the normal to the surface of the sphere ...