Precession of Earth's rotational axis due to the tidal force raised on Earth by the gravity of the Moon and Sun (Source: Wikipedia).
[ the companion star happens to be Sirius. Except the time frames appear too large. The cycle of the Zodiac is 24000 years. That means we are presently far away and have made our turn and now speeding up on the way back. Yet it makes sense that we would now be traveling at a fifth of our average speed. Thus our real period could be 24000 years. - arclein ]
- Mankind evolved out of Africa
- People were hunter-gatherers until about 5,000 years ago
- Tribes first banded together for protection from other warring parties
- Written communication preceded large engineered structures or populous civilizations
The Caral pyramids. Photo source: Wikipedia
The Tauroctony from Sterzing in the Tyrol (colour is modern). Image source.
Jarred Diamond, well-known historian-anthropologist and author of Guns, Germs and Steel, makes a good case that it is primarily local geographic and environmental advantages that determine which group of humans succeeds or fails versus another. Those that have the steel, guns, and bad germs win. Although this helps to explain many regional differences of the last few thousand years, it does not address the macro trends that seem to have affected all cultures, including China and the Americas, as they collectively slipped into the last worldwide dark age. The cyclical Great Year model overlays and augments Diamond’s observations with a reason for the widespread downturn. It implies that it is not only the geography and environment on Earth that determines a people’s relative success but also the geography and environment of Earth in space that affects humanity on a macroscopic scale. Just as small celestial motions dramatically affect life over the short term, so it appears that large celestial motions color life over the long term, resulting in the seasons of a Great Year.
Caption: The two equinoxes act as markers on the face of the celestial clock. The ancients used the autumnal equinox (AE) as the hour hand of the ages, with 500 AD as the low point. The renaissance represents the awakening from the Kali Yuga (Iron Age) to the Dwapara Yuga (Bronze Age). That process is now quickening at an exponential rate, akin to the Sun casting more light as it rises above the horizon.
The cycles referenced in the Vedic scriptures (Source)