View source for Longitude

[[Image:WorldMapLongLat-eq-circles-tropics-non.png|thumb|300px|Map of Earth showing some major latitudes]]
'''Longitude''' is a way to say where a place is on the [[Earth]]. It is [[measurement|measured]] starting from an imaginary north-south line called the [[Prime Meridian]]. (A [[meridian]] is an imaginary line drawn from the [[North Pole]] to the [[South Pole]].) Longitude says how far [[east]] or [[west]] of the Prime Meridian any place is.

Longitude is measured using degrees, the same way an [[angle]] is. The Prime Meridian is 0° (zero degrees), and the farthest away is +180° eastward and -180° westward. Unlike [[latitude]], which has the [[equator]] as a natural starting position, there is no natural starting position for longitude. Other meridians have been used in the past, but most scientists now agree to use the Prime Meridian.

Longitude, as opposed to latitude does not maintain a constant distance between degrees since the primary measurement is time, not distance. This means if you are near the North Pole, you can gain many degrees of longitude West by travelling a relatively short distance.

==Other pages==
* [[Latitude]]

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[[Category:Lines of longitude]]
[[Category:Measurement]]