to move in the reverse (counter-clockwise)direction unlucky; the latter method is consequently taken by witches in their ceremonies.
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Partly right etaoin, the widdershins direction is used by witches who practice so-called "black" magic.
Here's a site that defines some terms.
http://www.olywa.net/cagle/webchild/occult.html
Not endorsing in any way, just supplied for informational purposes. OK?