formula for great circle computation

From: (C. Michael Barnett )
Organization: Netcom
Date:         04 Oct 95 22:57:25 
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Greetings fellow aeronauts...

I wonder if anyone can provide me with the formulae to calculate great
circle course and distance given the latitude and longitude of the
departure point and destination.  I'm writing a corporate flight
scheduling program in Microsoft Access (ie visual basic), and need to
figure leg distances and directions.


C. Michael Barnett
Captain DiamondJet N4LK