When does the summer solstice solar term start?

When the sun shines directly on the Tropic of Cancer, its solar term is the summer solstice. Summer solstice is one of the 24 solar terms, which occurs on June 20th, or 2 1, or 22nd of the Gregorian calendar every year. On the day of summer solstice, the sun moves to 90 degrees of the yellow meridian (summer solstice, currently in Gemini), and the position of the sun directly on the ground reaches the northernmost point of the year, almost directly on the tropic of cancer.

At this time, the sunshine time in all parts of the northern hemisphere reached the longest in the whole year. For the Tropic of Cancer and its northern area, the summer solstice is also the highest day of the year at noon. On this day, the northern hemisphere received the most solar radiation, almost twice as much as the southern hemisphere. In geography and astronomy, the day when the sun directly hits the Tropic of Cancer, that is, June 22nd or 23rd every year, is called the summer solstice.