How does the length of day and night change from summer solstice to autumnal equinox?

The reason why the ancients can write the sentence "the morning rises and the moon returns" is because they have a profound understanding of the changes of day and night. Today, although we have watches and alarm clocks, we can check the time anytime and anywhere, but it is easy for us to ignore the seasonal changes. This article will show you how the length of day and night changes throughout the year.

From summer solstice to autumnal equinox, if you look at the length of day and night in the northern hemisphere, in the summer solstice season, the day is long and the night is short. On that day, the sun was almost directly on the Tropic of Cancer, and the daytime was the longest in a year. As the latitude went north, the daytime became longer, and the Arctic Circle and its north appeared extremely daytime. However, in the southern hemisphere, the days get shorter, the nights get longer, and the days get shorter and shorter further south, and there is an extreme night phenomenon in the Antarctic circle and its south. After this day, it is pointed out that the night will be longer and the day will be shorter, and on the day of the autumn equinox, the day and night will be equal.

What's the difference between the autumnal equinox and the winter solstice? The autumnal equinox solar terms are in the middle of autumn, generally around September 23rd of Gregorian calendar, and the length of day and night is similar. After this season, it can be clearly felt that the temperature is gradually decreasing and the temperature difference between day and night is increasing. The direct point of the sun will continue to move southward. When it reaches the southernmost point, the winter solstice will come, which is the shortest day and the longest night in a year. Among them, "zhi" is the ultimate meaning, which is extreme because of the spirit of winter storage. Sunrise and Sunset Direction ① At the vernal equinox, the sunrise and sunset directions all over the world rise from due east and fall from due west except the north and south poles. (2) During the summer solstice, when the sun shines directly on the Tropic of Cancer, except for the polar regions of day and night, it is the northeast of sunrise and the northwest of sunset. On the solstice of winter, when the sun shines directly on the Tropic of Capricorn, the sunrise on the Arctic Circle is due south, and then the sunset is due south, and the sunrise is southeast and the sunset is southwest everywhere. (4) From the winter solstice to the vernal equinox, except for the poles, the rising direction of the sun around the world gradually moves eastward and the setting direction gradually moves westward. Generally, sunrise is in the southeast and sunset is in the southwest.

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