The earth rotates once, and the time it takes to rotate once! And in which month are the changes of the four seasons distributed!

It takes about 23 hours and 56 minutes for the earth to rotate once and 365.25 days for the earth to revolve once. Since ancient times, our people have studied and recorded the division of the four seasons. There are four kinds here: first, the solar terms method. Astronomically speaking, the spring equinox, summer solstice, autumn equinox and winter solstice are the beginning of the four seasons. Beginning of spring, Changchun, beginning of autumn and beginning of winter were the four seasons in ancient China. This is based on the position of the earth in orbit. The second is the lunar calendar. Lunar calendar 65438+ October to March is spring, April to June is summer, July to September is autumn, and 65438+ October to 65438+ February is winter. The third is the solar calendar method. Meteorology usually takes March-May as spring, June-August as summer, September-165438+10 as autumn, and June-February as winter. The fourth is phenology. Willow leaves are scattered, peach blossoms are in full bloom, and spring is coming; Trees are shady, the sun is hot, and summer is here; Fruit leaves fall, water is cold, and the time sequence is autumn; The grass withered, the north wind roared, and the years entered the winter. The scientific division method is the fourth method of quantification, which divides the four seasons with the five-day average temperature as the index: the average temperature is stable below 10℃ as winter, above 22℃ as summer, and between 10 ~ 22℃ as spring or autumn.

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