How to calculate lunar calendar month

To calculate whether the lunar year has a leap month, we take the calendar year divided by 19, if divided by or for balances 3, 6, 9, 11, 14, 17 then that year will have a leap month.

Ms. Hoang Thanh Ha, in Thanh Tri, Hanoi worried about hearing the neighbors talk about information this year that was not profitable in September. "The family plans to hold their first son's wedding in mid-October of the lunar calendar. , if September is not profitable, we can hardly prepare everything properly for the wedding, " said Ms. Ha.

Wishing to have a baby in the 12th month of the lunar calendar this year, Ms. Nguyen Thuy Hoa in Dong Da, Hanoi stood still when she heard some girls asking each other this year whether the lunar calendar is September. Hoa wants to give birth to the Year of the Horse. If there is no more September, her child is expected to be born in the year of the Goat.

"The story of children is heaven and earth, but spiritually, I also want to be comfortable and have a calculation in advance so I want to give birth in the year, not to the next year , " Hoa said.

The second September of the lunar year corresponds to the October 24 solar calendar.

In some localities such as Ha Nam, Thanh Hoa, Quang Ngai, the information said that this year, it was not profitable in September, causing many people to work in agriculture. Rumors also appeared on many forums, social networks made many people puzzled when they had plans in the work before.

However, according to scientists' claims, the information is only speculation."In fact, in 2014, the profit of September was absolutely right," said Nguyen Duc Phuong, an astronomer - astronomer who confirmed to PV.

Mr. Phuong said, there are currently two ways to calculate the calendar according to the calendar and the lunar calendar, in which the solar calendar is the calculation of the Left cycle around the Sun. This type of calendar is officially used by the world. And the lunar calendar calculated according to the Moon cycle revolves around the Earth, mainly used by Eastern countries.

"Each calendar has different dates and leap months , " Ward said. With a solar calendar, the Earth's cycle around the Sun is 356+ 1/4 days. But according to the convention, each year has only 365 days, so the calendar year will be different from the real time of 1/4 day. This also means that after 4 years the calendar will be over a day and there will be a leap year. This leap year follows the convention that falls in February (ie, the month has 29 days).

Meanwhile, a lunar year has 354 days, and if compared with the solar calendar (365 days), the lunar calendar is shorter than 11 days."So every three years, the lunar calendar is 33 days shorter than the solar calendar, that is, the lunar calendar year will be a full month but not a day's profit like the solar calendar," Ward said.

Leap year corresponding to leap month has been calculated by leading researchers in the world.

According to Mr. Phuong, if you want to calculate that lunar year with a leap month or not only need to do simple math, take the calendar year divided by 19 if you divide or balance balances 3, 6, 9, 11, 14, 17 then surely."The world researchers have a very accurate way of calculating the calendar from millions of years ago so there is never a mistake , " Mr. Phuong said and recommended that people should use the calendar to follow. Watch crops and weather.

In the same view, Mr. Hoang Trong Hao, who works in the Journal of Youth Maths, also affirmed that the information without the first two months of the 9th year in 2014 is completely fabricated.

"Any lunar year that leaps and leaps in any month has been calculated, cannot suddenly change," Hao said.