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Autumn Equinox (Chinese: 秋分), the 16th solar term of the year, began this year on Sept 23 and ended on Oct 7. It arrives on when the sun reaches the celestial longitude of 180°. After Autumn Equinox, the temperature decreases obviously, and the differences between the temperature in the morning and in the night are also increasing, to more than 10 degree Celsius. The amount of rainfall decreases and it’s getting drier and drier in the air. For more information, please read:8 things you may not know about Autumn Equinox. [Photo by Wan Jin/Palace Museum]