20 12 when does the dog days start?

Crouching Tiger, Hidden Dragon. V means hiding. According to historical records, "those who lie down avoid midsummer". "Three volts" refers to the first, middle and last three volts, which is about the period from mid-July to mid-August. The lunar calendar founded in ancient China used heavenly stems and earthly branches to arrange years, months and days. Tiangan is composed of ten characters: A, B, C, D, E, G, Xin, Ren and Gui, and Dizhi is composed of twelve characters: ugly child must be in the sea in the afternoon.

According to the regulations, the third Geng day from the summer solstice is the first day of lodging, and it is also the first 1 day of lodging, and the fourth Geng day is the first day of lodging. The 1 th "Geng Day" from "beginning of autumn" is the start day of "late autumn", and the second Geng Day is designated as late autumn, that is, the dog days end.

Note: There are four Geng days between the summer solstice and beginning of autumn, divided into 10 days, and there are five Geng days, divided into 20 days. There are four days between the summer solstice and beginning of autumn in 20 12, so the dog days are 30 days. The summer solstice in 20 12 was at 7: 45 on June 2 1 day (May 3 of the lunar calendar), and the third "Geng Day" after the summer solstice appeared on July 18, which was the first day of crouching. On July 28, I entered "Zhongfu"; The 1 th "Geng Day" after "beginning of autumn" was August 7th, the first day of "Last Autumn".

The specific time is:

2012 July18 ~ July 27th is the first 10 day.

20 12 July 28th to August 6th is 10 day.

August 7th, 20 12 ~ 10 August 6th (the last day).

In addition: 20 12 June 2 1 Gregorian calendar, the third day of the fifth lunar month. Since 7: 45 this morning.

Start, enter the summer solstice solar terms. On this day, our northern hemisphere has the longest day and the shortest night.