What does the Gregorian calendar mean by "one white"?

The nine planets refer to one white, two black, three blue, four green, Huang Wu, six white, seven red, eight white and nine purple.

Fate refers to the twenty-eight stars, that is, seven nights in Qinglong: Jiao Mujiao, Kang Jinlong and Nyctereute Fang Ri, Rabbit, Heart, Moon, Fox, Tail, Fire, Tiger, Basket and Water Leopard.

Suzaku Seven Nights: Muan Jing Ghost Golden Sheep, Six Rabbits, Zhang Yuelu, Winged Fire Snake and Water Worm.

White tigers in the seven nights: the golden dog, the stomach soil, the pheasant and the Bigou fire monkey.

Seven nights in Xuanwu: unicorn, ox, Taurus, female soil, bat, virtual sun mouse, dangerous moon, swallowing room fire, pig wall water.

The six evils are the sun, the moon, the monkey, Du Ji and Zi Qi, which refer to the left eye, the right eye, the mountain root, the left eyebrow, the right eyebrow and Tang Yin respectively in physiognomy.

The five elements are fire, water and earth in Jin Mu.

Their relationship can't be clearly explained in one or two sentences, as long as you know that they are used for divination and fortune telling.