What are "vernal equinox, summer solstice, autumn equinox and winter solstice"?

Vernal equinox March 2 1 through: equator?

Direct from summer solstice to June 22nd: Tropic of Cancer (23 degrees 26 minutes north latitude)?

Autumnal Equinox Direct September 23rd: Equator?

Winter Solstice 65438+February 22nd Direct: Tropic of Capricorn (23 degrees 26 minutes south latitude).

1, one of the 24 solar terms of the vernal equinox, falls on March 20th or 2 1. On this day, the northern and southern hemispheres are as long as day and night.

2. The summer solstice is one of the 24 solar terms, which occurs on June 2 1 or 22 of the Gregorian calendar every year. On the solstice in summer, the direct sunlight from the sun reaches the northernmost part of the year and almost directly reaches the Tropic of Cancer. At this time, the day in the northern hemisphere is the longest, and the farther north it is, the longer it is.

3. autumnal equinox? The vernal equinox, the sixteenth solar term in the twenty-four solar terms of the lunar calendar, usually falls on September 22nd or 23rd every year. The climate in the south began to decline from this solar term. On this day, the sun reaches the longitude of 180 degrees, and points directly at the equator of the earth, so the day is divided into 24 hours, each with 12 hours; There is no extreme day and night phenomenon in the world.

After the autumnal equinox, the polar night range near the North Pole and the polar sun range near the South Pole gradually expanded. Twenty-four solar terms: "In mid-August, see the vernal equinox" and "the points are equal, which is 90 days and a half, so it is called points." Half a minute is the midpoint of ninety days in autumn.

4. Solstice in winter (English: Winter? Solstice), also known as "Winter Festival" and "Happy Winter", is one of the twenty-four solar terms in China and one of the eight astronomical solar terms, which is opposite to summer solstice. The winter solstice begins when the sun reaches 270 degrees of the yellow meridian, which is about 65438+February 22 of the Gregorian calendar every year. According to legend, the solstice in winter is the New Year's Day of the Zhou Dynasty in history, and it was once a very lively day. On the winter solstice, the direct position of the sun on the ground reaches the southernmost point of the year and almost directly reaches the Tropic of Capricorn (23 26' south latitude).