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Lewis Carroll
'''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°. 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°. 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>
Although lines of longitude may be imaginary, they are very important to navigators; [[Lewis Carroll]] joked about this in his long nonsense poem [[The Hunting of the Snark]]:
:"What's the good of Mercator's North Poles and Equators,<br>
:Tropics, Zones, and Meridian Lines?"<br>
:So the Bellman would cry: and the crew would replyv
:"They are merely conventional signs!<br>
Accordingly, the Snark uses a map which is "a perfect and absolute blank."
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