How many degrees does the sun reach the yellow meridian at the vernal equinox?

The vernal equinox begins when the sun reaches 0 degrees of the yellow meridian. The length of day and night is average, just half of the 90th day of spring, so it is called "vernal equinox". On the vernal equinox, the sun shines directly at the equator, that is, the latitude is 0, and day and night are almost equal. After that, the direct sunlight position gradually moved northward, and the days were long and the nights were short.

The vernal equinox is an important solar term, which not only has astronomical significance: the northern and southern hemispheres are equally divided day and night, but also has obvious characteristics in climate. At the vernal equinox, except the Qinghai-Tibet Plateau, the northeast, the northwest and the northern part of North China, China entered a beautiful spring. In ancient China, the vernal equinox was divided into three stages: "Wait for the birds to arrive, wait for the thunder, and wait for the electricity to rise." In other words, after the vernal equinox, swallows will fly from the south, and when it rains, the sky will thunder and lightning.