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A line of constant latitude, special ones are the equator, which separates north from south latitudes, the tropics (at 23.45 North and South) that mark the limits of the sun's north and south excursions, and the polar circles (at 90 - 23.45 North and South) that mark the latitudes above which it is possible for the sun to stay above or below the horizon for more than 24 hours.

In this usage, a "parallel" of latitude is analogous to a "meridian" of longitude.

Parallel can, of course, also refer geometrically to two lines in a plane that never intersect, or two planes in space that never touch.

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