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: In 1907, Albert Einstein started his ideas about the general theory of relativity. And it took eight more years after this to conceptualize, to mold, and to chisel (so to speak) so the theory could take proper form and come into being. The reason it took eight years to formulate and to produce his general theory of relativity was because the mathematics involved produced some difficulties to iron out. There are two different theories of relativity: general and special. For simplicityâs sake hereinafter in this book, we will call Einsteinâs special theory of relativity: Theory S. And we will call Einsteinâs general theory of relativity: Theory G. Thus, it took 8 years for Einstein to produce his Theory G. On the other hand, Einsteinâs Theory S only required six or eight weeks to create. Einsteinâs Theory S was a platform on to which to build higher and upward his Theory G, which is more expansive, and more all encompassing.