Summer solstice in 2020: Sunday, June 2, 20201day. On the summer solstice, the sun shines directly on the Tropic of Cancer. Shantou in Guangdong Province, Wuzhou in Guangxi Province, Gejiu in Yunnan Province and Chiayi in Taiwan Province Province are almost on the Tropic of Cancer. There is a "Tropic of Cancer" in Chiayi, which is a pagoda-shaped stone tablet for marking. By the summer solstice, there was not even a shadow of the tower. The summer solstice is also the longest day of the year. And the farther north, the longer the day. For example, in Beijing on the summer solstice, the day is about 14 hours and 58 minutes long; In Mohe and Wusuli at the northern end of Heilongjiang Province, the days of the summer solstice can reach 17 hours. North of the Arctic Circle, the sun doesn't set until the summer solstice. Miard, Finland, is almost in the Arctic Circle. Every year on the night of the summer solstice, local people like to run to the hills on the outskirts of the city and enjoy the "white night" sun. There are 73 "white nights" in Miard and its northern areas every summer. June 23rd is the "Midsummer Festival" in Finland. People will run into the forest, light bonfires and dance to welcome the "White Night".