ClarkeOn the summer solstice every year, the direct point of the sun reaches the maximum latitude in the northern hemisphere, that is, the Tropic of cancer, so it is also known as the "summer solstice". The Tropic of cancer is the farthest position from the equator to which the sun can shoot vertically in the northern hemisphere. It is an important latitude, about 23 ° 26 'north latitude (generally estimated as 23.5 °). The position of the Tropic of cancer is not fixed, but changes within 23.26 ° ± 1 ° north latitude.
Extended data:
The Tropic of cancer is the northernmost line where sunlight shines directly on the earth. On the summer solstice (around June 22) every year, it can be vertically irradiated by sunlight. Then the direct point of the sun moves south.
The area south of the Tropic of cancer (excluding the Tropic of cancer) in the northern hemisphere to the Tropic of cancer (excluding the Tropic of cancer) is directly exposed to the sun twice a year, which obtains the most heat and forms the tropics. Therefore, the Tropic of cancer is the dividing line between the tropics and the north temperate zone.
On the summer solstice every year, the latitude value of the direct solar point in the northern hemisphere reaches the maximum. At this time, it is the midsummer of the northern hemisphere. Since then, the direct solar point gradually moves south and always circulates between the two latitude circles near 23 ° 26 'north latitude and 23 ° 26' south latitude. Therefore, these two latitudinal circles are called Tropic of cancer and Tropic of cancer respectively.
The Tropic of cancer is also the dividing line between the south temperate zone, the north temperate zone and the tropics; The Antarctic Circle and the Arctic circle are the latitude circle composed of 90 degrees minus the degree of the regression line, which is the dividing line between the south temperate zone and the north temperate zone and the South cold zone and the north cold zone.
