Is Tomb-Sweeping Day a lunar calendar or a solar calendar?

Tomb-Sweeping Day is calculated according to the lunar calendar. Accurately speaking, Tomb-Sweeping Day is calculated according to the dry calendar and the solar calendar. When the solar calendar reaches 15, it means that Tomb-Sweeping Day has arrived. Generally speaking, the days when the longitude of the sun reaches 15 are mostly around April 5 of the Gregorian calendar.

Is Tomb-Sweeping Day a lunar calendar or a solar calendar?

Tomb-Sweeping Day is also called outing festival, outing festival, March festival and ancestor worship festival, which mainly appears at the turn of mid-spring and late spring. Different from other traditional festivals, Tomb-Sweeping Day is not only one of the 24 solar terms, but also a traditional festival.

The "Twenty-four solar terms" were originally divided according to the direction of Beidou bucket handle, and bucket handle began to rotate clockwise from the "Yin position". When the barrel handle points to "B", it is Tomb-Sweeping Day's anger.

In ancient times, 360 degrees of the longitude of the sun was divided into 24 equal parts, each equal part was 15 degrees, which was a solar term. According to the "average time method", the time between the winter solstice and the next winter solstice is divided into 24 parts, one of which is 15 degrees.

In other words, Tomb-Sweeping Day Qi will appear on the first 105 day after winter. This time is around April 5th of the Gregorian calendar, so people directly record Tomb-Sweeping Day as April 4th, April 5th or April 6th of the Gregorian calendar.

Although people remember that Tomb-Sweeping Day is one of these three days, in fact, Tomb-Sweeping Day's calculation is based on the dry calendar of the lunar calendar. And the 24 solar terms are calculated according to the lunar calendar, and so is Qingming.