The beginning of the old yellow calendar

Dog days, one volt is ten days, counted by days. Therefore, the dog days are divided into three days, that is, Geng Day on the third day after the summer solstice is the start day of the first volt.

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20 19 summer solstice time: 20 19 June 2 1.

20 19 the first Geng day after the summer solstice: 20 19 June 22nd (Geng Yin Day).

20 19 the second boxer day after the summer solstice: July 2, 20 19 (boxer day)

The third Geng day after the summer solstice is 20 19: 20 19 July 12 (Geng Xuri).

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