What is the nine squares in geomantic omen?

Feng Shui Jiugongge is actually a Luo Shu map. The formula is:

The fourth is the shoulder.

Eight or six is enough,

Left three right seven,

Nine plus one,

Five in the middle.

492

357

8 16

Four is southeast, nine is due south, and two is southwest.

Three are due east, five are in the middle and seven are due west.

Eight are northeast, one is due north and six are northwest.