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Originally Posted by Legrand
is the knowledge they had in those times, as shows for example the Mayan calender, of the north/sud pole axis of rotation of the earth doing a precessional circle in the sky that takes 25 920 years. It's from this movement of the axe of rotation of the planet that we say that we are entering the age of Aquarius that will last for about 2160 years.
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Perhaps it has to do with mathematical extrapolation based on what is known from years of observation of precession and observation is key.
https://www.quora.com/How-did-ancien...-the-equinoxes
.."Axial precession shows up as both procession of the equinoxes and the changes in the star closest to True North. People must have found such stars useful for navigating. But it would be noted that there were slow shifts:"...
..."Ptolemy compared his own observations with those made
by Hipparchus, Menelaus of Alexandria, Timocharis, and Agrippa. He found thabetween Hipparchus's time and his own (about 265 years), the stars had moved 2°40', or 1° in 100 years (36" per year; the rate accepted today is about 50" per year or 1° in 72 years). He also confirmed that precession affected all fixed stars, not just those near the ecliptic, and his cycle had the same period of 36,000 years as found by Hipparchus."....