As i understood nobody find exact correlation JiaZi - beginning of cycle and movement of planets.
At least nobody is writing about it..
Hi.
The Planets movement in relation to anything, be that other planets or the Earth or even themselves are very uneven. The idea a planet will have movement that takes exactly 10 years, 12 years or 60 years is not how it works. And if it takes 12 years and 1 day, in a few hundred years it will already be out of sync.
So we align with Sun and sometimes Moon, that is all you can count on. We have gone in some details in different theories and there are many. I can't find topics now, but should be in the archives in the forums. But in general - good idea would be to only count the Sun in the Five Arts. If you want more use western or vedic astrology or combine them like we do.
Nice to clarify that movements of the Earth are not that simple, either. But since they take at least 500 or more years to become important, we use estimates, but even the angle of the precession, the so popular 23,5 is estimate, much of what people present as constant are actually changing values.
So the Sun, solstices, equinoxes, the degrees of the rotation and stuff like that is awesome, that works. All else better ignore, at least with my current knowledge.