Well Gosh Don - does the little pyramid in the lower left represent the moon then?
If so, does the upper right one represent the sun? (doubtful)
Honestly, at first glance this truly reminds me of physics back in college and being asked to calculate the volume of a chicken...
"Well, first we assume a spherical chicken..."
Regardless, as I've stated before, more details on lengths/measurements within the picture would be appreciated. I think I may spend sometime this weekend drafting this out for you
As I've commented before, what you've hit upon is the unit circle. it's applicable to a good many things.