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On the Chinese lunar calendar, “Autumn Equinox” is the beginning of autumn and this day is just at the middle point between “Autumn Begins” to “Hoar-Frost Falls”. After “Autumn Equinox”, the temperature decreases obviously, just like the old proverbs among the farmers, “Each autumn rain makes it’s colder”, “The night of White Dews and Autumn Equinox, one night is colder than the one before”. It arrives on September 22 to September 23 each year when the sun reaches the celestial longitude of 180 degrees. As said in the ancient Chinese books, “the Autumn Equinox” shows the Yin Qi and Yang Qi are half and half on this day”. This means the day and night are balanced and the heat and the cold are even. There is no polar day or polar night happening on this day on every corner of the world. In some part of the north-east China, it’s not strange to see frost at this time. The differences between the temperature in the morning and in the night are increasing, to more than 10 degree Celsius. The amount of rainfall decreases and it’s getting drier and drier in the air.
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