What is the memory formula for 28 nights?

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

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 black dragons in the east, basaltic snakes in the north, white tigers in the west and suzaku in the south, which are connected for seven nights. They imagine four animal images, Jackie Chan, snake, tiger and bird, which are called four elephants.

The ancients in China used to observe the movements of the sun, the moon and the five stars. They were all stars. Knowing twenty-eight nights, some expressions in ancient books are easy to understand.

"The moon is out of the blue", which means that the moon returns, and the moon is out of Li, which means that it belongs to Li.

"Mars stays in Antares" means that Mars lives in the heart.

"Taibai eats the Pleiades" means that Venus covers the Pleiades.

In Su Shi's Fu on a Thousand Red Cliffs, "the moon rises from the East Mountain and wanders between bullfights", and "bullfighting" refers to fighting and cattle lodging.