Why are the intervals between solar terms unequal?

Because the 24 solar terms must be based on the true position of the sun in the sky, it is actually a "moment" rather than a "day". China's traditional calendar is a combination of Yin and Yang, and the criterion is the movement of the sun (day, year and solar terms) and the movement of the moon (month). However, because the earth's orbit around the sun is elliptical. Near the sun, the speed of the earth's revolution is slow, but far away, it is faster. So the interval between solar terms is not equal.

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