What do the nouns 12 in the yellow calendar mean-Tiande, Baihu, Yutang, etc.

The white tiger, heavenly punishment, suzaku, heavenly prison, Xuanwu and Gouchen in the Yellow Calendar are the evil days of the six underworld. Qinglong, Tiande, Yutang, Siming, Tang Ming and Jingui are auspicious days in the Gregorian calendar. In the yellow calendar, except for the day, dangerous day, fixed day, holding day, becoming day and opening day are auspicious; In the Gregorian calendar, there are fierce days, full days, weekdays, broken days, closed days and closed days.