These two solar terms are as long as day and night.

The two solar terms as long as day and night are the vernal equinox and the autumnal equinox.

The vernal equinox is around March 2 1 every year, and the world is divided equally between day and night. The direct point of the sun is the equator. The autumnal equinox around September 23rd divides the world into day and night, and the direct point of the sun is the equator. In addition, summer solstice and winter solstice: summer solstice, the time is around June 22 every year, with the longest day and the shortest night in the northern hemisphere, the shortest day and the longest night in the southern hemisphere, and the direct point of the sun is the Tropic of Cancer. The winter solstice lasts about 65438+February 22nd every year, with the shortest day and the longest night in the northern hemisphere and the shortest day and night in the southern hemisphere. The direct point of the sun is the tropic of Capricorn. Vernal equinox points to the summer solstice, with long days in the northern hemisphere and short nights in the southern hemisphere; The summer solstice points to the autumnal equinox, with long days in the northern hemisphere and short nights in the southern hemisphere; The autumnal equinox refers to the winter solstice, with short days and long nights in the northern hemisphere and short nights in the southern hemisphere; The winter solstice points to the vernal equinox, with short days and long nights in the northern hemisphere and short nights in the southern hemisphere. The vernal equinox and autumnal equinox are solar terms with special significance in the Spring Festival and autumn. The vernal equinox represents the arrival of warmth and the autumnal equinox represents the arrival of cold. During the vernal equinox, the climate is mild, the rain is abundant and the sun is shining, and the wintering crops in most parts of China enter the spring growth stage. In the autumn equinox, most parts of China have entered a cool autumn with more rainfall and lower temperature.