Why is there a saying that Taoism has 28 stars and Buddhism has 27 stars?

There are 28 stars in Taoism and Buddhism in China. There are no 27 stars.

Twenty-eight constellations are twenty-eight star regions divided by astronomers in ancient Han Dynasty to observe the movements of the sun, the moon and the five stars, which are used to explain the positions of the sun, the moon and the five stars. Details are as follows:

Twenty-eight stars:

Seven Nights of the Oriental Black Dragon: Jiao, Kang, Bian, Fang, Xin, Wei and Ji (jο).

Seven nights in northern Xuanwu: fighting (dǒu), cows, women, emptiness, danger, houses and walls.

Seven Nights of the West White Tiger: Kui, Lou, Chang, Bi, Gou and Shen.

Seven Nights in South Suzaku: Well, Ghost, Willow, Star, Zhang, Wing and Zhu.

There are several stars every night. 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.