Solution: Which solar term is the autumnal equinox?

The autumnal equinox solar term is one of the two special solar terms in the twenty-four solar terms, because the day and night time is twelve hours. Moreover, at this time, most parts of southern China really entered autumn in climate. So where does such a special day rank among the 24 solar terms?

The autumnal equinox solar term is the sixteenth solar term in the twenty-four solar terms of the lunar calendar, and the climate in the south begins to enter autumn from this solar term.

On this day, the sun reached longitude 180 degrees and hit the equator of the earth directly. So a day is divided into 24 hours, and each hour has 12 hours. There is no extreme day and night phenomenon in the world. Entering the autumnal equinox, we should strengthen physical exercise, pay more attention to psychological adjustment and diet adjustment, and eat more warm food in the diet.

Every year on the day of the autumnal equinox, tens of millions of people all over the world are doing "vertical egg" experiments. How this toy, called "China Custom", became a "world game" is still difficult to verify. However, the game is simple and interesting: choose a smooth and symmetrical fresh egg that has just been born for four or five days, gently stand it up and put it on the table. The autumnal equinox has become the best time for vertical egg games, so there is a saying that "when the autumnal equinox arrives, the eggs will look good." The eggs that stand up are very beautiful.

The north and south poles share the same day. On this day, the sun shines directly on the equator, and both poles can see the sun at the same time and share the same day.

The height is as long as the shadow on the 45 ~ latitude line, so you can measure the height of the building without climbing up, because they seem to have negotiated with their own shadows: because the height of a day is as long as the shadow, you know the length of the shadow and the height of the building.

You can't find your own shadow because the direct point of the sun shines on the equator impartially. When you come to the equator, you will find that you can't find your own shadow.

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