Longitude
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Lines of longitude or meridians are maginary lines that run north and south across the earth. They are used to measure east-west location, relative to a "prime meridian" which by definition is 0°. While in the past many meridians have been used, since 1884 the Greenwich Meridian has become the universal standard. [1]
References
- ↑ Wile, Dr. Jay L. Exploring Creation With Physical Science. Apologia Educational Ministries, Inc. 1999, 2000