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 ancient jewish and chinese and other calendars also were devised to track these things... modern technology allows us to also further monitor the sunspots, plasma channels and explosions that blast plasma at us, and shower us with X-rays and other things, these all have massive influences, and the Hindus and their Yuga thing... yes, turns out that this is a cycle that is created by the rotation of the galactic disc and when it gets to the vertical points every ~12000 years it can cause such drastic effects as causing the entire earth to rotate to a new rotation axis, the 6000 and 12000 and 25000 year cycles the hindus talked about are real, and we are in the midst of a reversal now, and likely within 30 years there could be such a dramatic disaster that very few of us survive

according to fossil and genetic records, one of these transitions some 50,000 years ago almost wiped out humans altogether