What are the constellations of 28 stars and how many stars are they made up of?

These 28 stars have nothing to do with 12 constellation. The following is their introduction.

The twelve constellations, or zodiac signs, are astrologically described areas where the sun passes through the zodiac on the celestial sphere, including Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius and Pisces. Ophiuchus also passes through the zodiac, but it does not belong to the zodiac used in astrology. In astrology, the zodiac is defined as 1928. After the international astronomical union standardized the constellation boundary, there are 13 constellations on the zodiac.

Eighteen constellations are twenty-eight star zones divided by ancient astronomers in Han Dynasty to observe the movements of the sun, the moon and the five stars, which are used to explain the positions of the movements of the sun, the moon and the five stars. The details are as follows: Twenty-eight stars: Seven Nights of the Oriental Black Dragon: horn, health, ground, room, heart, tail and dustpan (J ρ); Seven nights in northern Xuanwu: fighting (dǒu), cows, women, emptiness, danger, houses and walls; Seven nights of western white tigers: Que, Lou (lóu) and stomach. As an important part of Chinese traditional culture, it has been widely used in ancient astronomy, religion, literature and astrology, astrology, geomantic omen, lucky choice and so on. Different fields give it different connotations, and the related content is very complicated. At present, its original origin is still inconclusive. If we look at the cultural relics, the lacquer box unearthed in Sui County records the complete names of 28 families for the first time. It is recognized by historians that Twenty-eight Nights was first used in astronomy, so its position in the history of astronomy is quite important and it has always been a topic of interest to Chinese and foreign scholars.