This article is from the Lefthanders FAQ, by Barry D. Benowitz b.benowitz@telesciences.com with numerous contributions by others.
This is a baseball term. It seems that on many (most) baseball diamonds
the left hand side of the pitchers mound would face south.At one
time, most ball-parks were constructed so that the setting sun was
behind the batter so as not to be in his eyes. The LH pitcher's
throwing arm would then be toward the South as he faced the plate.
With larger grandstands in modern stadia (not to mention indoor
baseball) this is less of a concern than it once was.
Thanks: Jeff Snyder <jps@tyrell.net>
 
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