The solar calendar is based on the sun. What is the lunar calendar based on? Why is the annual 65438+10.8 the cold dew in the 24 solar terms?

The lunar calendar is based on the moon orbiting the earth.

The origin of the cold dew solar term is around June 8 10 (June 8 -9 10) every year. When the sun moves to longitude 195 degrees, it is the cold dew of 24 solar terms. "Cold dew" means that the temperature in this period is lower than that in "White dew", and the dew on the ground is colder and will soon condense into frost. Twenty-four solar terms: "September solar terms, dew will condense when it is cold."

If the "white dew" solar term marks the change from hot to cold, then the summer heat has not completely disappeared, and crystal dew can still be seen in the morning. Then the "cold dew" solar term is a symbol of cold weather, marking the transition from cool to cold. The dew is cold and radiant. As the saying goes, "cold dew cold, Coody Leng everywhere dew".

In ancient China, the cold dew was divided into three stages: "The first stage was the swan goose; The second waiting sparrow is a clam; Three chrysanthemums have yellow flowers. " In this solar term, geese move south in a line or herringbone queue; In the cold late autumn, all the birds disappeared. The ancients saw a large number of clams suddenly appearing on the seashore. The stripes and colors of shells were very similar to those of birds, and they thought they were birds. The third stage of "Chrysanthemum begins to blossom" means that the chrysanthemum has opened in a large area at this time.