Spring rains shake the spring and clear the valley, and midsummer is full of summer heat. What does summer mean?

Small summer heat: fighting refers to Xin; The solar calendar is 105. Summer heat; Slight summer heat refers to when the climate begins to get hot. Gregorian calendar 06-08 July.

Summer heat: bucket finger c; The solar calendar is 120. The hottest time of the year. July 22-24 of Gregorian calendar.

Twenty-four solar terms were formulated by ancient people according to the position change of the earth on the ecliptic (that is, the orbit of the earth around the sun), and each solar term corresponds to the climate law that the sun reaches a certain position every time it runs 15 on the ecliptic.

The earth's orbit around the sun was named "ecliptic" by the ancients, also known as "solar ecliptic". The ecliptic is divided into 24 equal parts, separated by 15, forming 24 solar terms. The 24 solar terms are actually 24 solar terms, 2 per month.

Twenty-four solar terms take the earth's revolution around the sun as a cycle, which basically summarizes the different positions of the sun on the ecliptic at different times of the year, the exact time of cold coming and summer going, the laws of natural phenomena such as rainfall and snowfall, and the time of recording some phenological phenomena in nature.

All the year round begins with "four stands", and the so-called "stand" is the beginning. Beginning of spring, Changxia, beginning of autumn and beginning of winter represent the beginning and arrival of spring, summer, autumn and winter respectively. In order to express the characteristics of time series more accurately, the ancients divided the solar terms into four groups according to the weather and phenology: divided, arrived, opened and closed. "Minute" refers to the vernal equinox and the autumnal equinox.

In ancient times, it was called "dichotomy"; "Solstice" is the summer solstice and the winter solstice, which was called "the second solstice" in ancient times. "Qi" refers to beginning of spring and Changxia, "Closed" refers to beginning of autumn and beginning of winter, and beginning of spring, Changxia, beginning of autumn and beginning of winter are collectively called "Sili", which add up to * * * to "eight sections". Corresponding to the most important "eight festivals" in the solar terms. If you choose the key points in the eight sections, it is the "second solstice" of the summer solstice and the winter solstice.

In winter solstice, the sun reaches the southernmost point, while in summer solstice, the sun reaches the northernmost point, which is what the ancients said: "The sun reaches the north, with long days and short shadows, so it is called summer solstice." Do your best.