How did the palace master determine the astrology?

What you want to ask is the palace star!

For example, the constellation of the first house is Aries, and the guardian star of Aries is Mars, so the main star of the first house is Mars, the first house is also the rising house, and the main star of the first house is the main star of life. Look at the constellations in each house, and then look at the guardian stars of the constellations, and you will know the answer.

Of course, there are also cases of robbing the palace, that is, two palaces enter the same constellation at the same time.