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.
This description of a site outside SERC has not been vetted by SERC staff and may be incomplete or incorrect. If you
have information we can use to flesh out or correct this record let us know.