To answer the original, question:
The approx. distance bewteen any two satellites can be roughly calculated as follows:
The distance = 2 x pie x r x degrees bewteen satellites/360
Now the distance is usually referred to as "arc" as it not a straight line, but is a measurement over a curved line (i.e. the circumference of a circle); and "pie" = 3.14
So, for sake of round numbers, if the clark belt is approx. 22,000 miles above the surface of the earth, and the earth's radius is approx. 4000 miles, then, the "r" in our equation becomes 26,000 miles.
Doing the rough math, we get 453.5 miles for every one degee of separation bewteen satellites. So, if two satellites are 2 degrees apart, then the arc between them is approx. 900 miles long. The straight line distance is a bit less, but this is a good start.
This is a VERY ROUGH approximation. Interesting, though, eh?