Here's a puzzle for you... Assume the Earth to be a perfect sphere (which it is not) having a diameter of exactly 7,926.34 miles. Given two coordinates, find the shortest distance between them (without digging any tunnels or trenches, or going under water). In other words, what is the shortest distance you must travel on the surface of the sphere to get from one point to the other? Starting point: 43° 55' 0.80", -118° 29' 28.37" Ending point: 32° 11' 52.54", -92° 17' 59.30"