Why is it not the hottest time when the earth is closest to the sun at the vernal equinox and the autumnal equinox?

Beginning of spring is the first day of spring, and the bucket handle of the Big Dipper faces east. As the saying goes, in beginning of spring, water is heated for three minutes a day, and then it will arrive at the vernal equinox after the rain. The vernal equinox is also one of the most important solar terms among the 24 solar terms. The so-called vernal equinox is the coincidence in this word. It is a coincidence that the vernal equinox happens to be the equinox day of spring. By the vernal equinox, spring has passed half, that is, late spring.

Another coincidence is that the vernal equinox and autumnal equinox in a year are just days with the same length as day and night, that is to say, after the vernal equinox, people in the northern hemisphere will feel that the days are obviously longer than the nights.

There are three stages in the vernal equinox, namely, when birds arrive, that is, when winter is over, birds return home in droves, when it thunders and when it thunders. Therefore, since the vernal equinox, atmospheric games have become more intense. When it rains on cloudy days, it begins to thunder and lightning. There is often windy and sandy weather in the north, and peach blossom season in the south.