This presentation proofs that the 11 (!) Giza pyramids in Egypt together with the Great Sphinx form a kind of clock (or calendar). This clock represents the third dimension of time. Plato reffered to this third dimension of time as the ‘Great Year’. It is also known as the Precession of the Equinoxes.
This video shows that the Giza pyramids were built about 8000 years before the arrival of the first Pharaoh in Ancient Egypt. If the interpretation of this clock is correct, than humanity will reenter the Period of Light in the year 2012 AD.