What day of the year are the 24 solar terms?
spring
1, the sun position in beginning of spring, beginning of spring is 3 15 degrees, February 2-5.
2. The rainy sun is located at 330 degrees of the yellow meridian, and the solar term is over on February 18-20.
3. The thorn sun is located at 345 degrees of the yellow meridian, and the festival will be held on March 5-7.
4. The sun at the vernal equinox is located at 0 degrees of the yellow meridian, and the festival will be held on March 20-22.
5. The Qingming Sun is located at longitude 15 degrees, and the festival will be held on April 4-6.
6. The sun in the Grain Rain is located at 30 degrees longitude of the Yellow River, and it intersects on April 19-2 1 day.
summer
1. The sun in the long summer is located at 45 degrees of the yellow meridian, and it is a holiday on May 7.
2. Xiaoman Sun is located at 60 degrees of the Yellow Meridian, May 20-22.
3. the awn seed sun is located at 75 degrees of the yellow meridian, and it is a holiday on June 5-7.
4. The summer solstice sun is located at 90 degrees of the Yellow Meridian, and the intersection point is on June 2 1-22.
5. The light summer sun is located at the longitude of the Yellow River 105, and it is celebrated on July 6-8.
6. In summer, the sun is located at 120 degrees, and the festival will be held on July 22-24.
autumn
1, beginning of autumn Sun White Dew is located at 135 degrees, and will be on August 7-9.
2. In summer, the sun is located at 150 degrees, August 22-24.
3. The Millennium Sun is located at longitude 165 degrees, on September 7-9.
The autumnal equinox sun is located at longitude 180 degrees, and will pass the solar term on September 22-24.
5. The cold dew sun is located at the node of longitude 195 degrees and 65438+1October 8-9.
6. The first frost sun is located at longitude 2 10, and the node is 65438+1October 23-24.
winter
1, the sun position of beginning of winter is 225 degrees at the longitude of the yellow meridian,165438+17-8 October.
2. Xiaoxue Sun is located at 240 degrees of the yellow meridian, and the node is165438+1October 22-23.
3. The snowy day is located at 255 degrees of the yellow meridian, and the festival will be held at 65438 on February 6-8.
4. The sun from winter to sunrise is located at 270 degrees of the yellow meridian, and the intersection point is 65438+February 2 1-23.
5. The slight cold sun is located at 285 degrees of the yellow meridian, and the node is 65438+1October 5-7.
6. The severe cold day is located at 300 degrees of the Yellow Meridian, and the node is 65438+1October 20th -2 1.
The 24 solar terms are divided according to the position of the earth on the ecliptic. Depending on the sun starting from the vernal equinox (longitude zero, at this moment the sun shines vertically on the equator), every advance of 15 degrees is a solar term; After a week's operation, I returned to the vernal equinox, which is a tropical year with 360 degrees, so it is divided into 24 solar terms.
The twenty-four solar terms reflect the annual apparent motion of the sun, so their dates are relatively fixed in the Gregorian calendar. The solar term in the first half of the year is on the 6th, the solar term in the second half is on the 8th and the solar term is on the 23rd, with a difference of 1 ~ 2 days. The earth revolves around the sun once every 365 days at 6: 09 and 10 second (exactly) and rotates once every 24 hours.
Because the orbital plane of the earth's rotation is not the same as the equatorial plane, but maintains a certain inclination angle, the position of direct sunlight on the earth is different all year round. In the northern hemisphere, the sun shines directly on the Tropic of Cancer (23 26' north latitude), which is called summer solstice in astronomy. When the sun shines directly on the tropic of Capricorn (23 26' south latitude), it is called the winter solstice; The solstice in summer and the solstice in winter mean that it is halfway between summer and winter.