"Three Volts" will teach you astronomical experts how to calculate the date of entrainment and the length of volt

Xinhua News Agency, Tianjin, July 14th (reporter Zhou Runjian) officially entered “deadline” on the 17th. Next, people will usher in a 40-day “three days of the day”. Then, what day does the world enjoy? "How many days are there in the sky?" Astronomical experts provide a simple algorithm for the public here.

Members of the Chinese Astronomical Society and the Tianjin Astronomical Society Shi Zhiqiu pointed out that according to China's traditional cadre, the first day of the first day of voluntary observance is the third day after the summer solstice, and the date of introduction can be dated to mid-July. .

“For the present century, from July 11 to July 20, these 10 days are called 'into the volatility' (except for 2084, except for the July 10th). The only remaining time is to get into the specific date of the volts," said Zhi Zhiqiu.

He stressed that the public is reminded to remember the number of 21. For even years, the integer obtained by dividing the last two digits of 21 minus the year by 4 is the date of entry; for odd years, 5 must be added to the result; If the result is outside the "entry zone", it should be added 10 or minus 10 to fall within the range of 11 to 20.

For example, in 2016, 21-[16/4]=17, the date of incorporation in the year is July 17. In 2049, 21-[49/4]=9, because it is an odd number, 9+5=14. The date of incorporation on that year was July 14; in 2081, the result was 6, which was less than the value of the “entrance interval” and should be 6+10=16, so the date of indefining of the year was July 16; in 2017, the result was 22 If it is greater than the value of the "entry zone," the value of 10,22-10=12 should be subtracted. Therefore, the date of incarnation of the year is July 12.

As to whether the volt age is 30 days or 40 days, there is a question of whether it is medium- or low-lying. Lin Guang, member of the Chinese Astronomical Society and director of the Tianjin Astronomical Society, said that generally speaking, the date of incarnation will be after July 18 (including The year of 18) is 30 days old, with a medium volt; the year of the incursion day before July 17 (including 17th), the volt age is 40 days, and both are middling (both this year and last year). There are only a few exceptions to this rule.

According to the statistics for the 500 years from 1600 to 2099, there are 182 years for 30 days, 318 years for 40 days, and the number of years in the two years is much longer than the number of years in the middle. .

“From this point of view, people's general remarks on the 'three' days may actually be called 'four' and may be more practical,' Lin said.

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