I am having difficulty parsing your comment. You are equating Tao Te Ching and astrology in the same bucket ? One is a philosophy, a way of looking at life - the other I don't know what to call it. And if you say that both are ways of looking at the world then we can apply that yardstick to everything and it doesn't get us anywhere.
>> That is to say, it's not true! but over millennia, humans have found it to be useful.
What part of core ancient philosophies about how one should conduct oneself are not true but useful ?