Guess three numbers at the vernal equinox on March 20th.

This year's vernal equinox is March 20th, so the number is 3, 20 or 3+2+0 = 5.

The vernal equinox is the midpoint of 90 days in spring. One of the 24 solar terms, around the fifth day of the second lunar month (about March 20-2 1 in Gregorian calendar). On this day, the northern and southern hemispheres are as long as day and night. On the vernal equinox, the sun shines directly at the equator, and day and night are almost equal. The difference is that it is spring in the northern hemisphere and autumn in the southern hemisphere. Then the direct sunlight position gradually moved northward, the solar radiation in the northern hemisphere gradually increased, and the weather became warmer day by day. At the same time, the days get longer and the nights get shorter. The spring equinox solar terms are affected by the intersection of cold and warm air masses, and the rain will also increase. As the saying goes, "The spring equinox begins with wheat, and the fat and water should follow". A spring rain was warm. After the spring rain, I was busy plowing. The busy farming season in spring is about to begin, and spring management, spring ploughing and spring planting are about to enter a busy stage. After the vernal equinox, overwintering crops enter the growth period, so field management should be strengthened. As the temperature rises rapidly and the water demand is relatively large, farmers should strengthen water storage and moisture conservation.