Of course it wasn't always perfect, some consequences consisted of Being too weak. Being a bad ruler. Ect. And this was often shown by earthquakes and natural disasters.
Mandate of Heaven-a political theory of ancient China in which those in power were given the right to rule from a divine source. For more definitions on Chinese terms, you can go to...
It's a Chinese thing. It means that you don't rule legitimately any more. The people lose confidence in you, and more to the point, the second tier rulers seek to replace you rapidly, involuntarily,...