What do you mean by "four bright days in the yellow calendar"?

And December eclipse and underworld * * *.

However, in Cantonese, because the word "Shu" in Tong Shu is homophone with the word "lose", it is also called "Tong Sheng" because of taboo. The main contents of the Gregorian calendar are 24 solar terms, such as daily taboos, dry branches, spiritual values, stars, moon phases, zodiac luck, auspicious and evil spirits (ecliptic, underworld) and so on.

"ecliptic" is a special term in astronomy. There are ecliptic and equator in astronomy, but there is no "underworld". The concept of "evil day in the underworld" is a term coined by the ancient yellow calendar compilers relative to "auspicious day in the zodiac".

Traditional calendar:

The almanac composed of the solar calendar, the lunar calendar and the official calendar is called the yellow calendar, also known as the old yellow calendar, the yellow calendar and the children's life. It is an almanac, which contains a lot of rules and contents related to seeking happiness and avoiding evil. Almanac is a code of conduct followed by ancient emperors and a calendar promulgated by emperors, so people call it "imperial calendar"; After the Revolution of 1911, the imperial system was overthrown, and the "imperial calendar" was renamed as "yellow calendar" by homonym.

The yellow calendar not only includes astronomy, meteorology, seasons and seasons, but also contains some taboos that people should abide by in their daily lives. Its content guides the farming opportunity of working farmers in China, so it is also called the farmers' calendar. People in the Gregorian calendar are also commonly known as "general books".