Since when do nights get longer?

Summer solstice in the northern hemisphere (winter solstice in the southern hemisphere).

The annual summer solstice is June 2 1 or 22. "The sun is north, the days are long and the shadows are short, so it is called summer solstice. At best, it is excellent. " From summer to the sun, the direct sunlight reaches the northernmost point of the year, almost directly to the Tropic of Cancer (23 26' north latitude), and the daytime in the northern hemisphere reaches the longest. Since the summer solstice, the position of direct sunlight on the ground has gradually moved southward, and the days in the northern hemisphere have become shorter, which means that the nights have become longer. There is a folk proverb that "eating noodles on the solstice in summer will shorten the day". At this time, the southern hemisphere is in the middle of winter.