You are always looking for scientific evidence but tell me what science studies for instance how someone ‘hears’ astral music and can prove it by performing some of it. In the same way it is possible to show a correspondence of events with the yugas and the orbit around a dual as Sri Yukteswar describes and Paramahansa Yogananda also does in - not one place but - many of his writings. So the person you hold suspect is Tara Mata a nun who wrote a book on the yugas and was with Paramahansa Yogananda for many many years helping him transcribe his books. Not saying this is wrong mccoy but you must realize she got the whole idea from being in the presence of the Master for years. I am strongly considering that science has yet to catch up with the innovative intuitive genius of our spiritual Masters. I also want to remind you, at no time did Sti Yukteswar clarify he was speaking of physical reality or did he specify the ages and dual were of a causal significance. You would think he meant in the physical realm but since he does not say we are left to understand the import of his words.
As a rational and logical human being i ask you; To give this some thought. It takes over 230 million years to get around the Milky Way. So do you really think that in all thar time the Sun and our solar system has only one attraction; that is to the orbit of the center of the galaxy?
https://yoganandaharmony.com/tara-mata“There are more things in heaven and earth, Horatio, than are dreamt of in your philosophy” ~Shakespeare