The white dew is early, the cold dew is late, and planting wheat in the autumn equinox is exactly what it meant at that time.

"The white dew is early, the cold dew is late, and the autumnal equinox is just right", which means that the autumnal equinox is the best time to plant wheat. From Liang Bin's Fog Map: When the old man saw her coming, he said, "This kind of wheat has been planted. As the saying goes, the white dew is early, the cold dew is late, and the autumn equinox wheat is just the right time. There are twenty-four festivals a year, and the autumn equinox is here. "

The autumnal equinox is the sixteenth of the twenty-four solar terms and the fourth solar term in autumn. Fight refers to unitary; The sun reaches the yellow meridian180; Celebrated on September 22-24 of the Gregorian calendar every year. On the day of the autumnal equinox, the sun shines almost directly on the equator of the earth, and the length of day and night is equal all over the world. The autumnal equinox means "equally divided" and "equally divided", which means equally dividing autumn except day and night. After the autumnal equinox, the position of direct sunlight moves south, and the days in the northern hemisphere become shorter, the nights become longer, the temperature difference between day and night increases, and the temperature drops day by day.