Which is longer day and night Why are there days and nights

It depends on the time. At the spring and autumn equinoxes, the sun shines directly on the equator, and the global equinox of day and night. From the spring equinox to the summer solstice, the direct point of the sun begins to move north, and the days in the Northern Hemisphere gradually become longer. By the time of the summer solstice, the daylight hours are the longest, and the sunrise in the northeast is just after 4 o'clock.

From the summer solstice to the autumnal equinox, the length of the day gradually shortens, and by the autumnal equinox the day and night are 12 hours. The sunrise is 6 o'clock and the sunset is 6 o'clock in the world.

From the autumnal equinox to the winter solstice, the days in the Northern Hemisphere gradually become shorter to the shortest winter solstice. In winter, we feel that sometimes it is not dawn at 7 o'clock. , mostly in the dark. In the Arctic Circle, the phenomenon of polar night occurs.

From the winter solstice to the vernal equinox, the day lengths gradually become longer, and the day and night are equal to the vernal equinox.

So to sum up, the length of the day and the length of the night look at the season, depending on the location, which hemisphere to look at.

The rotation of the earth produces the alternation of day and night, and the rotation causes the length of day and night to change with the seasons and latitude.

The equatorial region has equal day and night length throughout the year.

On the day of the spring and autumn equinoxes, the sun shines directly on the equator, and the global day and night are of equal length.

1. The vernal equinox points to the summer solstice.

Northern Hemisphere: Long days and short nights.

The spring equinox day and night are of equal length, and the subsequent days are longer and the nights are shorter, and the summer solstice has the longest day and the shortest night. Polar daylight occurs in the North Pole, and the polar day range is expanding; The summer solstice has the largest range of polar days, and the polar days within the Arctic Circle.

Southern Hemisphere Short days and long nights.

The day and night of the vernal equinox are of equal length, the following nights are lengthened and the days are shortened, and the summer solstice night is the longest and the shortest. Polar night occurs in Antarctica, and the polar night range is expanding; The polar night range is the largest on the summer solstice, and the polar night in the Antarctic Circle.

2. The summer solstice points to the autumn equinox.

Northern Hemisphere: Long days and short nights.

The summer solstice has the longest day and the shortest night, followed by a shortened day and a longer night, and the autumnal equinox is the same length as the day and night. The Arctic polar daylight is shrinking.

Southern Hemisphere Short days and long nights.

The summer solstice night is the longest and the shortest day, and the following nights are shortened and the days are lengthened, and the autumnal equinox day and night are the same length. The extent of the polar night in Antarctica is shrinking.

3. The autumnal equinox points to the winter solstice.

Northern Hemisphere: Short days and long nights.

The autumnal equinox is equal in length to day and night, the days are shortened and the nights are lengthened, and the winter solstice night is the longest and the day is the shortest. Polar night occurs in the North Pole, and the polar night range is expanding; The polar night range is the largest on the winter solstice, and the polar night in the Arctic Circle.

Southern Hemisphere Long days and short nights.

The autumnal equinox is equal in length to day and night, and the following nights are shortening and the days are lengthening, and the winter solstice is the longest day and the shortest night. Polar daylight occurs in Antarctica, and the polar day range is expanding; The winter solstice has the largest range of polar days, and the polar days in the Antarctic Circle.

4. The winter solstice points to the spring equinox.

Northern Hemisphere: Short days and long nights.

The winter solstice night is the longest and the shortest day, and the following night is shortened and the day is lengthened, and the spring equinox day and night are the same length. The Arctic polar night is shrinking.

Southern Hemisphere Long days and short nights.

The winter solstice has the longest day and the shortest night, and the following days are shortened and the nights are lengthened, and the spring equinox is equal in length and night. The Antarctic polar daylight range is shrinking.

Day and night are due toThe rotation of the Earthgenerated.

The Earth is a non-luminous and opaque sphere that rotates, so at any one time, the Sun can only illuminate half of the Earth's surface. Half of the world illuminated by sunlight is day, and half of the world that is not illuminated by sunlight is night. Since the Earth's axis is tilted, the length of day and night varies in different parts of the Earth.

The earth is a non-luminous and opaque sphere, and sunlight can only illuminate half of the globe at a time, half of the globe illuminated by sunlight is day, and half of the globe that is not illuminated by sunlight is the dividing line between night, day and night hemispheres.

circle), called the morning and dusk line.

circles). The earth we live on does not shine in itself. The light and heat on the earth are mainly due to the fact that the sun is shining, and the hemisphere where the sun shines is daytime, and the place where the sun does not shine is night.

The earth is a sphere, which constantly rotates from west to east around the earth's axis, which is called the rotation of the earth. In this way, the earth receives sunlight.

The hot part is constantly changing. The part that gets the sun's heat is constantly changing, and the part that doesn't get the sun's heat is also changing, resulting in a constant alternation of day and night.

The only island on earth that has no time.

The South Pole and the North Pole are known to be located in the polar regions, and polar daylight occurs in these two places.

The polar night phenomenon, which is also unique to their two regions, when the polar day and polar night arrive, it may be all dark for 24 hours.

Or White Nights. The reason for the formation is mainly related to the rotation of the earth itself, when it revolves around the sun, the earth will have an inclination angle according to its own gravitational force.

The tilt time of this tilt angle is about half a year, so this makes the polar day and polar night phenomenon often occur in the south pole and the north pole, and if one side has a perennial back to the sun and the polar night occurs, the polar day will occur otherwise.

Summary. The rotation of the Earth causes the movement of the direct point of the sun between the two lines of gravity. This causes changes in the length of day and night and the height of the sun at noon.

The length of day and night is the same at the same latitude. Then, when the sun shines directly on the northern hemisphere, the days are longer and the nights are shorter in the northern hemisphere, and the days are shorter and the nights are longer in the southern hemisphere. The daylight gradually increases from south to north around the world; Therefore, when you reach the Arctic polar regions, the daylight is very long, and when the sun shines directly on the Tropic of Capricorn, the Arctic Circle is the polar day, and the Antarctic Circle is the polar night; The direct point of the sun is in the southern hemisphere, the days are short and the nights are longer in the northern hemisphere, the days are longer and the nights are shorter in the southern hemisphere, and the global daylight gradually shortens from south to north.

So when you get to the Antarctic Pole, the day is very long, and when the sun hits the Tropic of Capricorn directly, the Antarctic Circle is the polar day, and the Arctic Circle is the polar night.

Why are nights longer than days.

The rotation of the Earth causes the movement of the direct point of the sun between the two lines of gravity. This causes changes in the length of day and night and the height of the sun at noon. The length of day and night is the same at the same latitude.

Then, when the sun shines directly on the northern hemisphere, the days are longer and the nights are shorter in the northern hemisphere, and the days are shorter and the nights are longer in the southern hemisphere. The daylight gradually increases from south to north around the world; Therefore, when you reach the Arctic polar regions, the daylight is very long, and when the sun shines directly on the Tropic of Capricorn, the Arctic Circle is the polar day, and the Antarctic Circle is the polar night; The direct point of the sun is in the southern hemisphere, the days are short and the nights are longer in the northern hemisphere, the days are longer and the nights are shorter in the southern hemisphere, and the global daylight gradually shortens from south to north. So when you get to the Antarctic Pole, the day is very long, and when the sun hits the Tropic of Capricorn directly, the Antarctic Circle is the polar day, and the Arctic Circle is the polar night.

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A: The spring equinox is the spring equinox and the autumn equinox, which is March 21 and September 23.

Day and night are as long as they are on the spring and autumn equinoxes, March 21 and September 23. On the vernal equinox, the sun shines almost directly on the Earth's equator, while on the autumnal equinox, the sun reaches 180° of ecliptic longitude (the autumnal equinox), so the day and night are almost the same length, 12 hours each.

The spring equinox and autumn equinox are the midpoints of the 90 days of spring and autumn, hence the name. The vernal equinox is a relatively important solar term, which not only has astronomical significance: the equinox of day and night in the northern and southern hemispheres, but also has obvious characteristics in terms of climate.

In ancient times, it was also called "the middle of the day", "the equinox of day and night", and "the moon of mid-spring".

Because the phenomenon of day and night occurs because the earth itself is not luminous and opaque, the sunlight can only illuminate half of the globe at the same moment, and when the sun's rays hit the earth, it can only illuminate half of the earth, and the other half is night, thus producing day and night. The dividing line between the day and night hemispheres is called the morning and dusk line.

Why is there day and night?

We experience the alternation of day and night every day, which is caused by the constant rotation of the earth. The usual day-night cycle is one day, and the main reason is that it takes 24 hours for the Earth to complete a solar day.

But because the Earth's axis is tilted, the length of day and night is different in different parts of the Earth. In the north and south poles of the earth, the sun shines obliquely throughout the year, and the length of day and night varies the most.

In the high latitudes of the northern and southern hemispheres, the sun never sets or does not come out all day, that is, it is day or night 24 hours a day.