What's the date of Tomb-Sweeping Day in 2022, and what's the date of the lunar calendar in Tomb-Sweeping Day every year?

Speaking of Tomb-Sweeping Day, we all know that it is a solar term, but in addition, Tomb-Sweeping Day is also a festival of sacrifice. Many people don't know much about the origin of Tomb-Sweeping Day. As far as the traditional festival of China is concerned, it has existed since the Zhou Dynasty. Astronomers in the Zhou Dynasty were very clever. According to the method of measuring the sun shadow in Tugui, they determined the 24 solar terms in China, including Tomb-Sweeping Day. What's the date of Tomb-Sweeping Day in 2022, and what's the date of the lunar calendar in Tomb-Sweeping Day every year?

As far as the time in Tomb-Sweeping Day is concerned, people have always said that Tomb-Sweeping Day is the 4th and 5th, but the exact date in Tomb-Sweeping Day is not fixed, that is, it is not necessarily April 5th in Tomb-Sweeping Day. This is mainly because Tomb-Sweeping Day's calculation is different from other festivals, that is, we can't just look at the new calendar and the lunar calendar. Tomb-Sweeping Day was originally a solar term, and the ancients had their calculation methods, while modern astronomers also had a more advanced division method, that is, according to the position of the sun on the ecliptic, 24 solar terms were divided.

But most ordinary people don't know the ecliptic. What is this? To talk about the yellow meridian of the sun, we must first talk about the 360 degrees of the yellow meridian. In fact, this is the degree of the earth's revolution. When the longitude of the Yellow River is 360 degrees, it is necessary to divide 360 degrees into 24 equal parts, that is, each part 15 degrees is a solar term, so there are 24 solar terms. Now the Gregorian calendar divides the ecliptic into 365 equal parts, which is 365 days. At the same time, because of the ratio of 24 copies to 365 copies, the specific dates of solar terms will be different. Therefore, the date in Tomb-Sweeping Day is not fixed. It may be April 5, sometimes April 4.

Traditional festivals such as Spring Festival, Lantern Festival and Mid-Autumn Festival are calculated according to the lunar calendar, and the main basis of this calculation method is the full moon, that is, when the sun shines directly on the equator, we will usher in the vernal equinox among the 24 solar terms. At this time, the longitude of the yellow meridian is 0. When the sun reaches the longitude 15 degrees, we will have a sunny day. This method has been used for more than 300 years since 1645. You can also look at the night sky in an ancient way. If the bucket handle of the Big Dipper points to the southeast, that is, the Z position, it will be clear.

Tomb-Sweeping Day, also known as Tomb-Sweeping Day, is a traditional ancestor worship festival in China and one of the legal holidays in China. Tomb-Sweeping Day holiday appeared in ancient times, and the holiday time of each dynasty was different. Tomb-Sweeping Day began in Tang Dynasty, and Tomb-Sweeping Day and Cold Food Festival began in Xuanzong period of Tang Dynasty. 1935, the government of the Republic of China clearly stipulated April 5th as a national holiday in Tomb-Sweeping Day, and Tomb-Sweeping Day became a national holiday in 2008.

Tomb-Sweeping Day time is different every year, and it may be Tomb-Sweeping Day from April 4th to April 6th in the new calendar. This year's new calendar is April 5, 2022 in Tomb-Sweeping Day. If the fifth day of the third month of the lunar calendar, then Qingming is the fifth of the 24 solar terms. As a festival, Qingming is different from pure solar terms. Solar terms indicate phenological changes and seasonal order, but festivals contain many contents, such as festival etiquette, spiritual beliefs and so on. Sacrificial culture and ancestral belief are the important reasons for the formation of Tomb-Sweeping Day, and Tomb-Sweeping Day is an important carrier of family ethics and belief inheritance.