Master Yin and Yang are proficient in the theory of five elements, and then observe astronomical phenomena, but also draw a five-star array to summon gods. (The first two items were the most basic knowledge of being a teacher of Yin and Yang in ancient Japan, and the last two items were later deified and added by people themselves. )
Feng shui master is similar.
In short, in modern terms, these two are astronomers and geographers. If the landlord wants to learn from them, he must strengthen his study in these two aspects.