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单词 latitude
释义
latitude

Mathematics
  • Suppose that the meridian through a point P on the Earth’s surface meets the equator at P′. Let O be the centre of the Earth. The latitude of P is then the angle P′OP, measured in degrees north or south. Latitude and longitude uniquely fix the position of a point on the Earth’s surface. The term also describes the circle of points of a given latitude; and more generally, on a surface of revolution, a latitude is any circle produced by the rotation of a point of the generating curve of the surface.


Astronomy
  • The angle north or south of some reference plane. In astronomy, the equivalent of terrestrial latitude is termed declination. See also celestial latitude; galactic latitude; heliocentric latitude.


Geography
  • Parallels of latitude are imaginary circles drawn round the Earth parallel to the equator. The parallels are numbered according to the angle formed between a line from the line of latitude to the centre of the Earth and a line from the centre of the Earth to the equator. Those regions lying within the Arctic and Antarctic circles, having values of 66.5° to 90°, are termed high latitudes. Low latitudes lie between 23.5° north and south of the equator, i.e. within the tropics. Mid-latitudes, also known as temperate latitudes, lie between the two.


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