Why do the stars in ancient poems refer to the enemies of ethnic minorities?

In ancient times, stars were used to represent good luck or bad luck, and enemies represented evil. Generally represented by Mars.

Mars, known as a comet, is the son of Chi Di in the south. Its whereabouts are uncertain and flickering, symbolizing war and disaster.

The ancients watched celestial phenomena at night, mainly at Sanyuanli and 28 nights. Three walls: Taiwei wall, Wei Zi wall and Shi Tian wall. Twenty-eight lodging places: East Black Dragon seven lodging places, West White Tiger seven lodging places, South Suzaku seven lodging places, North Xuanwu seven lodging places. In addition, we also observed the moon and five planets in Jin Mu, such as water, fire, earth and comets.