Why is there 17 days from summer solstice this year?

One of the 24 solar terms. In fact, solar terms should be accurate not only to the day, but also to the hour and minute, 365÷24= 15.2 1 day, and each solar term is 15.2 1 day on average, so if it is the night of summer solstice, it is possible to enter a light summer day in the early morning. From the calendar, the difference between them is only 15.2 1 day. Summer solstice is one of the 24 solar terms, which occurs on June 2 1 or 22 of the Gregorian calendar every year.