What is the vernal equinox and solstice in high school geography?

The vernal equinox refers to four moments, the vernal equinox is the four nodes on the ecliptic, and the vernal equinox is the day when the four solar terms are respectively located.

The relationship between the above three concepts can be expressed as follows: On the vernal equinox, the sun is located in vernal equinox on the ecliptic.

The vernal equinox (March 2 1) and the autumnal equinox (September 23) split in two. At this time, the sun shines directly on the equator, and the global day and night are equal in length. The summer solstice (June 22nd) and the winter solstice (65438+February 22nd) are the second solstice, when the sun shines directly on the Tropic of Cancer, and the extreme day and night reach the maximum range.

Extended data

The traditional method of dividing the four seasons in our country takes the "four stands" in the 24 solar terms as the starting point of the four seasons and the dichotomy and dichotomy as the midpoint.

For example, in spring, beginning of spring is the starting point, the vernal equinox is the midpoint, and the long summer is the end point.

The division of the four seasons in the west takes "dichotomy and dichotomy" as the starting point of the four seasons, such as spring as the starting point and summer solstice as the end point.

Western countries are located at higher latitudes, far away from the intersection of Huangchi and Huangchi, and take "equal division to" as the starting point of the four seasons, which actually reflects the local climate better than "Li Si". The four seasons divided by "dichotomy" and "dichotomy" in the west are one and a half months later than those divided by "Li Si" in China.

Baidu Encyclopedia-divided into two parts