Which is more important, divination day or month?

This question is insightful. I will explain, but it must not be based on this. Because the study of Yi-ology is endless, let's start with the month. It is a day based on obvious changes, but it is not obvious. Therefore, ancient prophecies can only vaguely say that the moon and the sun are equal in merit and power. If you ask who's important, it's like saying it in vain. Modern forecasters say that the month will change, and what you ask is always there. How to sum up in practice? It is the best way to study easily without relying on others. I don't know what you think.