Yes, 3660 or so years.

Pi x Phi x 360 x 2 = 3659.89769

The Great Pyramid is a monument to the Earth change that happens on a regular schedule.

Pi = 3.1415927

Phi = 1.61803

Circle = 360 degrees

2012 AD
-1647.89769 BC
-5307.79538 BC
-8967.693071 BC
-12627.59076 BC
-16287.48845 BC
-19947.38614 BC
-23607.28383 BC
-27267.18152 BC

Check out what happened Earth-change-wise circa 1650 BC.

1650 BC: [link to www.google.com]

5300 BC: [link to www.google.com]

9000 BC: [link to www.google.com]

12600 BC: [link to www.google.com]