Why are Vietnamese and Chinese calendar different?

From 25-6 to 24-7 solar calendar, Chinese and Chinese lunar calendar (China) have a difference of one day. Meanwhile, in Vietnam, there exist both Vietnamese and Chinese calendars. Why is there such a difference and does it affect belief activities in Vietnam based on the Chinese lunar calendar? Mr. TRINH TIEN QUY, Chief of the State Calendar Department, explained:

- Specifically, on the 25th of June, the lunar calendar is on the 1st of June of the lunar calendar according to the Vietnamese calendar.

Then, on June 26, the solar calendar is the 2nd and 6th lunar month according to the Vietnamese calendar and the Chinese lunar calendar. This deviation lasts until the end of the sixth lunar month, that is, from the 25th of July, the lunar calendar of VN and China overlaps.

This phenomenon will continue to appear in January next year (Dinh Hoi's year). Specifically, February 17, 2007 will be the first day of the Lunar New Year according to the Vietnamese calendar but the Chinese calendar will be the 30th day of the New Year. Thus, next year, Vietnam will welcome the Lunar New Year a day earlier than China.

On the 14-7 calendar day, while our calendar has
lunar day is 20-6, the Chinese calendar (Wanjia) is 19-6
(Photo: V. Also)

* Sir, why is this difference?

- The cause of this discrepancy stems from the fact that Vietnam calculates the time by taking the international time + 7, and the Chinese calculate the time by taking the international time + 8, which leads to the difference when calculating the determined time. lunar calendar.

In the lunar calendar, the first day of the month is moonless day (called squirrel day). International lunar calendar date of June begins at 16:00 on the 25-6 calendar day. If you want to calculate the Vietnamese time, you have to add seven hours, so the day of the sixth month of the lunar calendar in Vietnam begins from 23:00 to 06 minutes, still in the 25-6 calendar day.

Therefore, the Vietnamese calendar dates from June 1 to the lunar calendar corresponding to the 25-6 calendar day, ie the lunar month is only the 29th day, no 30th day.

Meanwhile, China takes international time plus eight hours, so Chinese time-based care will start from 0:05 am the next day. Therefore, the Chinese lunar calendar is not June 25, but it was moved on June 26.

The difference in the lunar day in the lunar January of the following year is similar. The squirrel hour of January of the following year at international time is 16:15, plus an additional seven hours of Vietnamese time is 23:15, still on the 17th of February, so the first day of the Lunar New Year will coincide with February 17, while China will add eight hours. It is 0g15 so the first day of the Lunar New Year will coincide with February 18th.

However, in the lunar July of this year and the second lunar month of the following year, the international day-care day is calculated in Vietnamese time and Chinese time is still on the same calendar day so the lunar June this year and The lunar month of the next year of Vietnam will have 30 days, China's only 29 days. Therefore, the lunar calendar in July and February will not happen.

* How long will the difference between the lunar calendar of VN and TQ be repeated?

- According to our calculations, the deviation cycle in the lunar January between the two countries' calendar is 23 years. For example, in 2007 there was a negative calendar deviation in January. 23 years later, 2030 will continue to be misleading and the next 23 years, the year 2053 will be wrong. After this time, the deviation is not cyclical.

* Does this difference affect people's belief activities, sir?

- Currently in the people there may be two types of calendars being used. 15 million printed calendars this year all take the calendar data in the State calendar, so the lunar calendar is the Vietnamese calendar. China's electronic calendar or a number of Chinese printed calendars will have a Chinese calendar.

Although the day is negative in two different calendars, the day people often watch for religious activities is called the day of intervention. Which day can chi coincide with the calendar day, ie the day of Vietnam and China can overlap, there is no deviation so it does not affect.

For example, the past 25-6 calendar is the lunar day of the Vietnamese lunar calendar and the 30th day of the lunar calendar of China, but all are At Dau Day.

* Sir, what issues are currently posing for the Vietnamese calendar and the world?

- Currently, researchers in Vietnam, as well as the world, calculate plans to improve the lack of days in the solar calendar in February. As we know, February usually has 28 days, February has 29 days, while other months are 30, 31 days.

This difference causes certain troubles. For example, if a person was born on February 29, three years later, there was no birthday because those years were only 28 days in February. So there are people born on 29-2, about

3/4 life without birthdays. Therefore, researchers in the country and around the world have launched hundreds of new calendar reform plans that are scientific, simple and understandable for everyone.

HAPPY done