What does Gengri Gengri mean?

1. "Geng Day" refers to the day prefixed with Geng in the heavenly stems and earthly branches Ji Day Law. The third boxer is from the summer solstice, and the third boxer is the first time. It is said in "Study Tour Qionglin" that the first day of the first month is the third night in summer. Because the number of heavenly stems is 10, there is a Geng Day every 10 day, such as Geng Zi Day, Geng Yin Day and Chen Geng Day.

2. 365 days a year (366 days in leap year) is not an integer multiple of 10. One day this year is Geng Day, but next year is not necessarily Geng Day. Due to the uncertainty of Geng day, the date of accommodation is different every year. The dog days are the hottest time of the year, which can be divided into three days: the first, the middle and the last. This is because the days are long and the nights are short after the vernal equinox, and the sunshine is close to the direct summer solstice.