equator

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equator

equator imaginary great circle around the earth, everywhere equidistant from the two geographical poles and forming the base line from which latitude is reckoned. The equator, which measures c.24,902 mi (40,076 km), is designated as lat. 0°. It intersects N South America, central Africa, and Indonesia. The celestial equator is the projection of the plane of the earth's equator on the celestial sphere (see equatorial coordinate system ).

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equator

A Dictionary of Astronomy | 1997 | Â© A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

equator The intersection of the surface of a body with a plane perpendicular to the body's axis of rotation. The plane of the equator passes through the body's centre and divides the body into northern and southern hemispheres. All points on the equator are equidistant from the body's poles of rotation. See also Celestial Equator; Galactic Equator.

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