What is the longest solar term in a day in the northern hemisphere?

The longest day of the year in the northern hemisphere is the summer solstice. On this day, the sun shines almost directly on the Tropic of Cancer, which is the highest latitude that solar energy reaches in the northern hemisphere in a year. The sun runs to 90 degrees of the Yellow Meridian (summer solstice), and the direct ground position is almost direct to the Tropic of Cancer, and the daylight time in all parts of the northern hemisphere reaches the longest in the whole year.

The summer solstice is not only one of the 24 solar terms, but also a festival in the ancient folk "four seasons and eight festivals". Since ancient times, there has been a custom of offering sacrifices to gods and ancestors to the Japanese. "Heaven and earth are the foundation of life; Ancestors are the foundation of class. " Heaven and earth are the foundation of life, ancestors are the foundation of life, and ancestor worship is the custom of inheriting filial piety. In addition, there are folk customs such as "avoiding summer and hiding" and "clearing the field" from summer to Japanese.

Extended data:

Seen from the ecliptic plane, the sun is on the background of Taurus, Gemini and Cancer. The summer solstice is the northernmost day of the sun in a year, the limit of the sun's northward movement and the longest day in the northern hemisphere. The higher the latitude, the longer the days. This is because the "long day and short night effect" caused by the tilt of the earth's rotation axis is more obvious as it approaches two levels.

On the day of the summer solstice, except the south pole of the Antarctic circle and the polar night area, the sunrise direction in all parts of the earth starts from the northeast and sets in the northwest. The summer solstice is the northernmost day of the sun in a year and the limit of the sun's northward movement. On this day, the northern hemisphere gets the most solar radiation, almost twice as much as the southern hemisphere.

After the summer solstice, the Tropic of Cancer and its northern region, the midday sun altitude angle also began to decrease.