Have the days shortened since beginning of autumn?

Yes, after beginning of autumn, the direct point of the sun moved southward from1132 ′ n to 5 57 ′ n. As the direct point of the sun moved southward, the daytime hours shortened, the sunshine hours decreased day by day, and the light and heat in the northern hemisphere gradually decreased, which will continue until the vernal equinox.

Beginning of autumn, the 13 of the 24 solar terms, is the first solar term in autumn, which lasts from August 7th to 9th every year. At this time, the sun reached the longitude 135.

In beginning of autumn, precipitation and humidity are at the turning point of the year, showing a downward trend. In nature, everything grows from luxuriant maturity.

Beginning of autumn doesn't mean that the hot weather is over. In fact, it is still in the high temperature period in summer. Summer heat is only calculated in the second solar term in autumn, and the temperature in early autumn is still very high.