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  2. 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°

  3. Circle of latitude - Wikipedia

    en.wikipedia.org/wiki/Circle_of_latitude

    The equator is the circle that is equidistant from the North Pole and South Pole. It divides the Earth into the Northern Hemisphere and the Southern Hemisphere. Of the parallels or circles of latitude, it is the longest, and the only 'great circle' (a circle on the surface of the Earth, centered on Earth's center). All the other parallels are ...

  4. Great-circle navigation - Wikipedia

    en.wikipedia.org/wiki/Great-circle_navigation

    To find the way-points, that is the positions of selected points on the great circle between P 1 and P 2, we first extrapolate the great circle back to its node A, the point at which the great circle crosses the equator in the northward direction: let the longitude of this point be λ 0 — see Fig 1.

  5. Great ellipse - Wikipedia

    en.wikipedia.org/wiki/Great_ellipse

    Positions on the great circle of radius are parametrized by arc length measured from the northward crossing of the equator. The great ellipse has a semi-axes a {\displaystyle a} and a 1 − e 2 cos 2 ⁡ γ 0 {\displaystyle a{\sqrt {1-e^{2}\cos ^{2}\gamma _{0}}}} , where γ 0 {\displaystyle \gamma _{0}} is the great-circle azimuth at the ...

  6. Equator - Wikipedia

    en.wikipedia.org/wiki/Equator

    The equator is the circle of latitude that divides Earth into the Northern and Southern hemispheres. It is an imaginary line located at 0 degrees latitude , about 40,075 km (24,901 mi) in circumference, halfway between the North and South poles. [ 1 ]

  7. Geodetic coordinates - Wikipedia

    en.wikipedia.org/wiki/Geodetic_coordinates

    Geodetic latitude and geocentric latitude have different definitions. Geodetic latitude is defined as the angle between the equatorial plane and the surface normal at a point on the ellipsoid, whereas geocentric latitude is defined as the angle between the equatorial plane and a radial line connecting the centre of the ellipsoid to a point on the surface (see figure).

  8. Equatorial coordinate system - Wikipedia

    en.wikipedia.org/wiki/Equatorial_coordinate_system

    The right ascension symbol α, (lower case "alpha", abbreviated RA) measures the angular distance of an object eastward along the celestial equator from the March equinox to the hour circle passing through the object. The March equinox point is one of the two points where the ecliptic intersects the celestial equator.

  9. 16th parallel north - Wikipedia

    en.wikipedia.org/wiki/16th_parallel_north

    The 16th parallel north is a circle of latitude that is 16 degrees north of the Earth's equatorial plane.It crosses Africa, Asia, the Indian Ocean, the Pacific Ocean, Central America, the Caribbean, and the Atlantic Ocean.

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