When is the summer of solstice?

Generally speaking, the summer solstice is from June 2 1 day to 22/day of the Gregorian calendar every year. When the sun moves to 90 degrees longitude, it is the intersection of summer solstice, so the time from summer solstice is not fixed. On this day in summer, the sun shines directly on the Tropic of Cancer. At this time, the daylight time in the northern hemisphere reaches the longest in the whole year. After the summer solstice, the direct sunlight point gradually moves southward. Daylight saving time in the northern hemisphere begins at 05:43:33 on June 2, 2020. Lunar calendar: June 2 1 day or April 22 (30 years), that is, summer solstice. On this day in summer, the sun shines directly to the northernmost part of the year, almost reaching the Tropic of Cancer (23 26 ′ 28 ″ 44 north latitude), and the daytime in the northern hemisphere is the longest.