Ah welcome to the Precession of the Equinox. 
https://www.britannica.com/science/prece...-equinoxes
We look to the stars for the answer. The figures are based on the movement of the Zodiacal signs through the houses.
It is based on a complete cycle through all 12 signs. This is where the whole "Age of Aquarius" idea comes from.
https://earthsky.org/human-world/when-wi...rius-begin
However, as for precision, since we are doing cosmic scale calculations it's very difficult to get any precise idea of time.
If you are interested in reading, the book Fingerprints of the Gods by Graham Hancock is an interesting read that explores this idea in relation to the 'lost civilizations' of our world. Fun food for thought.
Also, yes, I believe that is exactly the cycle Ra is referring to. At least, that's what it looks like to me.
https://www.britannica.com/science/prece...-equinoxes
We look to the stars for the answer. The figures are based on the movement of the Zodiacal signs through the houses.
It is based on a complete cycle through all 12 signs. This is where the whole "Age of Aquarius" idea comes from.
https://earthsky.org/human-world/when-wi...rius-begin
However, as for precision, since we are doing cosmic scale calculations it's very difficult to get any precise idea of time.
If you are interested in reading, the book Fingerprints of the Gods by Graham Hancock is an interesting read that explores this idea in relation to the 'lost civilizations' of our world. Fun food for thought.
Also, yes, I believe that is exactly the cycle Ra is referring to. At least, that's what it looks like to me.
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