What's the saying about thunder after Mid-Autumn Festival?

1, the ancients divided each solar term into three periods, and the three periods of the vernal equinox were: the arrival of the first mysterious bird, the second thunder and the third electricity. The three stages of the autumnal equinox are: when the thunder stops, when the insects sting, and when the water is dry. It can be seen that the time of thunder should be between the vernal equinox and the autumnal equinox, which means it is not good to thunder after the autumnal equinox.

In a year, the sun passes above the equator twice on the ecliptic, that is, the vernal equinox and the autumnal equinox, so these two days are as long as day and night, which is called "equal division of day and night". But from vernal equinox to autumnal equinox, the days are long and the nights are short. After the autumnal equinox, the night is longer than the day.