When is the yellow day?

I know that auspicious days on the ecliptic used to calculate good luck or bad luck according to astrology. It means that the six stars, Qinglong, Tang Ming, Jingui, Tiande, Yutang and Siming, are auspicious gods. When you are on duty on the sixth day, everything is suitable. It is called "auspicious day of the ecliptic". It usually refers to a good day to do things. Huang Tian should be short for auspicious day.