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Dear Tom, and others who may be confused by this,

   Waldo is correct. Basic physical geography: great circles, such as the 
equator and all lines of longitude, which can be infinite in number, are 
abstract lines that divide the earth into two equal halves, at any angle. The 
five "great circles" of the Greeks, whatever they are, are not actually great 
circles: at least the tropics of cancer and capricorn are not.
(They do not divide the earth into equal halves.) 

Howard Horowitz
Professor of Geography
Ramapo College
[email protected]
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