Changes

'''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&deg;.  While in the past many meridians have been used, since 1884 the Greenwich Meridian has become the universal standard.  <ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>

'''Lines of longitude''' or '''meridians''' are imaginary 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&deg;.  While in the past many meridians have been used, since 1884 the Greenwich Meridian has become the universal standard.  <ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>

==References==

==References==

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