Why are the days long in summer and long in winter?

The sun is in the Tropic of Cancer in summer, the sun is in the Tropic of Cancer in winter, and the equator in spring and summer The heat and cold in summer and winter are not determined by the distance between the earth and the sun, because the orbit of the earth is almost circular, and the main reason is that the length of time the sun shines. The earth's autobiographical axis is not perpendicular to the orbital plane around the sun, there is an angle of degrees, so that the earth has a cycle of illumination at different latitudes at different positions in the orbit, in summer, the northern hemisphere has a long illumination time, the southern hemisphere is winter, the illumination time is short, there are two points of the summer solstice and winter solstice, only at the spring and autumn equinoxes, the northern and southern hemispheres have the same illumination time, specifically, on the summer solstice, the Tropic of Cancer becomes the equator, on the contrary, during the winter solstice, the Tropic of Cancer becomes the actual equatorial line. Summer in the Southern Hemisphere begins.

As for the long days in summer and the short days in winter, there is a direct relationship with latitude, the closer to the poles, the more obvious it is, and it is not obvious near the equator, which is related to the spherical surface, in the Arctic Circle, the beginning of the spring equinox to the autumn equinox, is an eternal day, there is no night, on the contrary, there is half a year of night, because the sun shines for a long time in summer.

This is because of the different positions of the direct sunlight spots. In summer, the direct point is in our northern hemisphere, so the daylight hours are very long, and in the winter, the direct point is in the southern hemisphere and vice versa. Spring and autumn direct spots are at the equator, so day and night are equal

In the summer, the sun shines directly on our hemisphere (the northern hemisphere), so the daylight hours are long, and in the winter, the sun shines directly on the southern hemisphere, and I feel that the nights are long in the northern hemisphere.

This is due to:Yellow and red cornersThe presence of the sun causes direct sunlight on the earthTropic of Capricorncaused by the phenomenon of moving back and forth.

In summer, the sun shines directly over the Northern Hemisphere.

The morning line slopes to the west, the dusk line slopes to the east, and the daylight range in the Northern Hemisphere becomes larger, so the days are longer and the nights are shorter; Summer solstice.

The direct point of the sun reaches the northernmost point, directly hitting the Tropic of Capricorn, and the day is the longest and the night is shortest in the northern hemisphere.

In winter, the sun shines directly on the Southern Hemisphere.

The morning line slopes to the east, the dusk line slopes to the east, and the day range becomes shorter, which means that the days are short and the nights are longer. From the summer solstice to the autumnal equinox, the direct point of the sun shifts southward, and the days become shorter and the nights longer in the Northern Hemisphere. On the winter solstice, the direct point of the sun reaches the southernmost point and shines directly at the Tropic of Capricorn.

The day is the shortest and the night is the longest in the Northern Hemisphere.

In the Northern Hemisphere, for example, the Sun is at its northernmost point. As a result, the days become longer in the summer; On June 21, the days in the Northern Hemisphere were the longest of the year. Keep in mind, though, that while the Sun appears to revolve around the Earth on Earth, the Earth is actually revolving around the Sun.

The situation in winter is the opposite in summer. In winter, the semi-axis is far from the sun. As a result, the Northern Hemisphere receives very little light in the winter, so the days are short in winter.

However, when it is winter in the Northern Hemisphere, it happens to be summer in the Southern Hemisphere, because the Southern Hemisphere is tilted towards the Sun. That's why summer in the Southern Hemisphere is in December.

China is located in the Northern Hemisphere, and the daylight range in the Northern Hemisphere becomes larger due to the fact that the direct sun shines in the Northern Hemisphere in the summer. So the days are long and the nights are short, on the contrary, the winter is the days are short and the nights are long.

Because the sun is on the Tropic of Cancer in summer and the sun is on the Tropic of Capricorn in winter, coupled with the influence of the Earth's rotation, there will be such a phenomenon.

This is related to the rotation of the earth and the distance around the sun, so this will lead to this situation.

This is because the Earth rotates and it revolves around the Sun.

Answer: The sun.

Analysis: The sun is very bright, and it is also a fireball, in winter due to the low orbit of the sun, so the time difference between day and night is large, and the daytime is short, and in summer, the orbit of the sun is high, the sunrise is early and the sunset is late, and the natural daytime is long.

The reason for the short days in winter and the long days in summer is due to the phenomenon that the earth's direct sun points move back and forth between the Tropic of Cancer and the Tropic of Cancer due to the existence of yellow and red angles on the earth.

In summer, when the sun shines directly into the northern hemisphere, the morning line slopes to the west, and the dusk line slopes to the east, and the day range in the northern hemisphere becomes larger, so the days are longer and the nights are shorter. On the summer solstice, the direct point of the sun reaches the northernmost point, directly hitting the Tropic of Capricorn, which is the longest day and the shortest night in the northern hemisphere.

In winter, when the sun shines directly into the southern hemisphere, the morning line is inclined to the east, and the dusk line is inclined to the east, and the day range becomes shorter, that is, the days are short and the nights are long; On the winter solstice, the direct point of the sun reaches the southernmost point, directly hitting the Tropic of Capricorn, and the day is the shortest and the longest night in the northern hemisphere.

Geographical significance of the Yellow Red Junction:

The magnitude of the yellow-red angle determines the range of the direct point of the sun, that is, the range between the Tropic of Cancer and the Tropic of Capricorn, and determines the degree of the Tropic of Cancer and the Polar Circle.

The movement of the point of direct sunlight:

The presence of the yellow-red angle and the fact that the northern end of the Earth's axis always points near the North Star during the Earth's revolution causes the direct point of the Sun to move back and forth between the Tropic of Cancer and the Tropic of Capricorn.

On the summer solstice, the sun shines directly on the Tropic of Capricorn, which is the northernmost position where the sun shines directly on the Tropic of Capricorn, and on this day, the northern hemisphere has the longest days and the shortest nights.

After the summer solstice, the direct point of the sun moves southward, and the days become shorter and the nights longer in various parts of the Northern Hemisphere.

On the winter solstice, the sun shines directly on the Tropic of Capricorn, which is the southernmost position where the sun shines directly, and on this day, the days are the shortest and the nights are the longest in the northern hemisphere.

After the winter solstice, the direct point of the sun moves northward, and the days are getting longer and the nights are getting shorter and shorter in the northern hemisphere.