orthodromics


From The Collaborative International Dictionary of English v.0.48:

Orthodromics \Or`tho*drom"ics\, n.
   The art of sailing in a direct course, or on the arc of a
   great circle, which is the shortest distance between any two
   points on the surface of the globe; great-circle sailing;
   orthodromy.
   [1913 Webster]
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