There are no stars in some houses in the Tiangong map. Why?

Hello, this situation is called empty palace, which means that the palace is empty and no stars fall in. Although it is an empty palace, it still has its own characteristics, depending on the constellation Gongtou and its ruler, also known as Gongtou Star. For example, someone's fifth house is empty, but the director of the fifth house is Gemini, the main star is Mercury, and Mercury is in Aquarius. Then this person is unconventional in love, attaches importance to spiritual communication, and likes to play intellectual games with lovers.