The Autumnal Equinox of exactly equal night and day signals the turning of the seasons. This means darker and colder up here in the Northern Hemisphere, while it starts to get lighter and warmer for the Southern Hemisphere. As the Sun moves into tropical Libra (as it always does on the Autumnal Equinox), we get a sort of equilibrium: not too warm and not too cold, rather nice.
The Sun itself has always been associated with the “king”, executive or president; and when the light of the Sun is dimmed it portends a crisis in that leader and therefore that nation which the leader represents.
Looking at the teaming oceans, the unnumbered blades of grass in the fields, the myriad stars in the night skies, the universe is abundant beyond measure, it doesn’t jealously count each blessing it dispenses. But abundance without purpose or a plan, becomes profligate, reckless and ineffective. So there is a governing factor that comes into play: karma, curbing excess, judiciously regulating the system, and insuring overall integrity to it.
Now back in ancient days, before western man realized that the Earth was not the center of the universe, it was thought that the planets actually stopped in the sky and moved backwards. After all, it seemed fairly obvious to them.