The same way how we know some earthquakes happen every so hundred years.Look at how much we’ve fucked up things just with Twitter and imagine what people would do with transhuman tech.
But why are there “Baktuns” and how did the Aztecs know about this?
The coincidence with 2012 and how much things have indeed changed since then is indeed pretty spooky and makes you wonder.
Im guessing they recorded events over a long period of time, noticed certain patterns on certain dates and then began to associate certain things because of those reoccurring events.
Take the current shit storm we dealing with now. Last time this type of crap happened was at the start of the 20th century.
Had the roaring 20s. Then the 30s. Then 1945 the end date.
So about 60 or 80 years the same series ofevents happen?
Just a wild guess