Gridding the Earth
http://www.classzone.com/books/earth_science/terc/content/investigations/es0303/es0303page02.cfm?chapter_no=investigation

Lenni Armstrong, NOAA, Exploring Earth


In this Flash animation, use the "Latitude," "Longitude," and the "Latitude and Longitude" buttons to introduce the earth's most popular coordinate system. Turn buttons on and off to stress lines of latitude (parallels) which run east-west across the map and are referenced to the equator Lines of longitude, on the other hand, are called meridians, which run north and south on the map and are read in reference to the prime meridian.

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This resource is referenced here:Keywords: latitude, longitude, cartography