Textual Research on the Old Huangli Futian Gengri

Dog days, one volt is ten days, counted by days. Therefore, the dog days are divided into three days, that is to say, the third day after long summer is the first dog day of the solstice.

Solstice time: June 9, 2065438.

From the summer of 20 19 to the first Geng day in the future: June 22nd, 20 19 (Geng Yin Day).

Summer of 20 19 to the second boxer day in the future: July 2, 20 19 (boxer day)

July 2065438, the third Geng day after the 65438 festival.

Therefore, the first day of this year is July 19 (Geng Xuri). Since the initial stay is 10 days, the initial stay this year is from July 12 to July 2 1 day.