But it is what we cannot see that forever links these monolithic structures to one another, for at the heart of their design lies a common mathematical equation that demonstrates an advanced knowledge—a knowledge of precession.

Again, a brief explanation:

As our planet floats through space on its yearly journey around the Sun, it rotates on its axis once every 24 hours. As the Earth spins, the gravitational pull of the moon causes it to tilt approximately 23.5 degrees to the vertical. Add the Sun’s gravitational pull on our planet’s equatorial bulge and you have a wobble at the Earth’s axis, similar to that of a spinning top. This wobble is called precession. Once every 25,800 years, the moving axis traces a circular pattern in the sky, relocating the position of the celestial poles and equinoxes. This gradual westward drift also causes the signs of the zodiac no longer to correspond to their respective constellations.

The Greek astronomer and mathematician, Hipparchus, is credited with having discovered precession in 127 BC. Today we know the Egyptians, Mayans, and Hindu understood precession hundreds, if not thousands of years earlier.

In the early 1990s, archaeoastronomer Jane Setters discovered that the Osiris myth of ancient Egypt had been encoded with key numbers that the Egyptians had used to calculate the Earth’s varying degrees of precession. Of these, a particular set of digits stood out among the rest: 4320.

More than a thousand years before the birth of Hipparchus, both the Egyptians and Mayans had somehow managed to calculate the value of pi, the ratio of the diameter of a circle, sphere, or hemisphere, to its circumference. At 481.3949 feet, the Great Pyramid’s height, multiplied by 2pi, precisely equals its base (3,023.16 feet). Incredible as it seems, the perimeter of the pyramid comes within 20 feet of equaling the diameter of the Earth, when our planet’s dimensions are scaled down to a ratio equaling 1:43,200, numbers representing our mathematical code of precession. Using the same ratio, the Earth’s polar radius is equal to the pyramid’s height.

It turns out that the Great Pyramid is a geodetic marker lying almost exactly on the 30th parallel. If its measurements were projected onto a flat surface (with its apex representing the North Pole and its perimeter the equator), the monolith’s dimensions would equal the Northern Hemisphere, scaled down to, again—1:43,200.

We know it takes 4.320 years for the equinoctial Sun to complete a precessional shift of two zodiacal constellations or 60 degrees. Multiply this number by 100 and you have 43,200, the number of days noted in the Mayan Long Count calendar equaling 6 Katuns, one of the key numerical values the ancient Maya used when they calculated precession. A complete cycle of precession takes 25,800 years. If you add up all the years of the Popol Vuh’s five cycles, the time period equates exactly to one precessional cycle.