The concept of the ‘Great Year’ is based on the astronomical phenomenon that occurs due to the Earth's axis slowly rotating over a period of approximately 25,920 years. <...> This motion produces an apparent rotation closer to, then further away from, the center of the MilkyWay Galaxy.
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The primary effect for our solar system, and thus for Earth and Humanity, is a rising and falling amount of Galactic Center Emanations (GCE). This is a descriptor for the radiation that comes from the massively collected solar systems at the galactic center. The radiation levels are many millions, if not trillions of times that of our sun in the collective emanations emerging from the galactic center.
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The effect of more of the GCE is thought to be a higher quality of intelligence being available throughout the Earth biosphere at all levels, including that of human intelligence. It is this ‘intelligence increasing on exposure to more GCE’ that forms the mechanism that powers the Hindu concept of the Yugas.
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Sources, mostly in Sanskrit, but also in Hebrew, and other languages, when interpreted in light of our modern understanding, suggest that the GANZ of the Space Alien Invaders was a radiation shield of considerable size, perhaps covering many thousands of square miles in some instances. This word, GANZ, is inappropriately translated as ‘garden’ in the christian Bible, and some versions of the Torah. It is not a hebrew word. It comes from the Elohim/Annunaki themselves.

These GANZ were electro-magnetic bubbles over the genetic laboratories of the Space Invaders. These bubbles were what allowed the Judeans in the Old Testament to live 900+ years. It is suspected that it was the level of the GCE within the bubbles that provided humans with this lifespan.
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Current thinking is that there is evidence for the opposite case to be made; that is, that the GANZ were radiation shields that effectively concentrated, or captured, the Galactic Center Emanations.