Kong Ming said that a general should know astronomy, geography and wonders.

In order to teach the truth, it is to use soldiers. Soldiers don't mean soldiers who are armed. People who are good at fighting can use the battlefield environment to create an environment conducive to their own war and influence and destroy the enemy. Astronomy mainly refers to the sun, moon, astrology and climatic conditions-this is time and geography, mainly topography, landforms and landforms-this is geographical advantage, and so on. Use these objective environments to create war conditions for yourself. Qimen mainly refers to the method of prediction and calculation, and the judgment of the future according to the present situation.