Define longitude. . . !See English top ans. :/
Added by Diane P.
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Longitude is a geographic coordinate that specifies the east-west position of a point on the Earth's surface. Show more…
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Longitude is the angular distance (expressed in degrees) east or west of the prime meridian, which goes from the North Pole to the South Pole through Greenwich, England. Arcs of $1^{\circ}$ longitude are $110 \mathrm{~km}$ apart at the equator, and therefore $15^{\circ}$ arcs subtend $15(110) \mathrm{km},$ or $1650 \mathrm{~km},$ at the equator.
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