angle between two points

In NCL, how can I compute the angle in degrees between two lat/lon points?
Let's say I have lat1,lon1 and lat2,lon2. Let's say the wind is blowing from
lat2,lon2 to lat1,lon1. How do I compute the wind direction in degrees?

Thanks, Michael
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Received on Fri Jun 3 10:01:19 2011