When is the solstice in summer?

June 20th to 22nd of the Gregorian calendar is the summer solstice.

Solstice is the earliest of the 24 solar terms. The longitude of the yellow meridian is 90 degrees, 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 daylight hours in all parts of the northern hemisphere reach 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.

The solstice in summer is the turning point of the sun. After that, the point of direct sunlight begins to move south from the Tropic of Cancer, and the days in the northern hemisphere will become shorter day by day. After the summer solstice, the Tropic of Cancer and its northern region, the midday sun height angle also began to decrease. At the same time, after the arrival of the summer solstice, the stars in the night sky gradually became summer stars.

Like the winter solstice, the summer solstice is also a solar term reflecting the changes of the four seasons. Astronomy stipulates that the summer solstice is the beginning of summer in the northern hemisphere. From summer to the future, although the direct point of the sun began to move south from the Tropic of Cancer, the daytime in the northern hemisphere began to shorten gradually, and the height of the sun began to decrease day by day for the Tropic of Cancer and its northern area.

However, because the heat radiated from the sun to the ground is still more than the heat radiated from the ground to the air, the temperature will continue to rise in the future, so there is a saying that it is not too hot from summer to the sun. According to historical data, the historical extremes of many cities in the north appear after the summer solstice.