@ Dr. Heinz Lycklama
Gravitation Force
nGravitation force is inversely proportional to the square of the separation distance between the two masses.  This fundamental force holds the universe together, controlling the orbits of all members of our planetary system. 
nWhy is the number not 1.99 or 2.01?  Any value other than 2 would lead to an eventual catastrophic decay of orbits and of the entire universe
Evidence of an essential design!