ACOS((SIN(RADIANS(LOOKUP(AVG([Latitude]), First()))) * SIN(RADIANS(AVG([Latitude]))) + COS(RADIANS(LOOKUP(AVG([Latitude]), First()))) * COS(RADIANS(AVG([Latitude]))) * COS(RADIANS(AVG([Longitude])) - RADIANS(LOOKUP(AVG([Longitude]), First()))) ))* [Miles/Kilometers]