Is the vernal equinox as long as day and night?

The vernal equinox is as long as the night.

The vernal equinox and autumnal equinox in China's 24 solar terms are exactly two days in a year when the sun shines vertically on the equator of the earth. That is to say, one day in the first half of the year is the vernal equinox and the other day in the second half is the autumnal equinox. These two days are very special, and day and night are as long as each other, so they are called vernal equinox and autumnal equinox.

After the vernal equinox, the days gradually increase and lengthen, while the nights remain short day by day until the autumnal equinox, and the days are as long as the nights. After the autumnal equinox, the day time is shorter and the night time is longer, and the cycle is one year.

Weather characteristics of vernal equinox and solar terms

During the spring equinox and solar terms, the East Asian trough is obviously weakened, and the trough ridge activity in the westerly belt is obviously enhanced. From Mongolia to the northeast, there are often low-pressure activities and cyclone development. Low-pressure movement causes cold air to go south, and it is windy and windy in the north. When the long wave trough moves eastward, there will be continuous rainy and cold weather due to the intersection of cold and warm air masses.

After the vernal equinox, the south began to enter a period of frequent strong convective weather. As the weather gets warmer and the soil thaws, the dusty weather in the northern region also increases.