Circle of latitude, about 40,075 km in circumference, that divides Earth into the Northern and Southern hemispheres.- Equator
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A solar equinox is a moment in time when the Sun crosses the Earth's equator, which is to say, appears directly above the equator (rather than north or south of the equator).
Ellipsoid of revolution or rotational ellipsoid, is a quadric surface obtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi-diameters.
The current World Geodetic System model uses a spheroid whose radius is 6,378.137 km at the Equator and 6,356.752 km at the poles.
The tropics are the regions of Earth surrounding the Equator.
Circle of latitude that contains the subsolar point at the December (or southern) solstice.
Its latitude is currently south of the Equator, but it is very gradually moving northward, currently at the rate of 0.47 arcseconds, or 15 metres, per year.
Also referred to as the Northern Tropic, is the most northerly circle of latitude on Earth at which the Sun can be directly overhead.
Using a continuously updated formula, the circle is currently north of the Equator.
The Northern Hemisphere is the half of Earth that is north of the Equator.
The celestial equator is the great circle of the imaginary celestial sphere on the same plane as the equator of Earth.
One of the two polar circles and the most northerly of the five major circles of latitude as shown on maps of Earth.
The position of the Arctic Circle is not fixed and currently runs north of the Equator.
Circular movement of an object around an axis of rotation.
This rotation induces a centrifugal acceleration in the reference frame of the Earth which slightly counteracts the effect of gravitation the closer one is to the equator.
Most southerly of the five major circles of latitude that mark maps of Earth.
The position of the Antarctic Circle is not fixed and currently runs south of the Equator.