Why is there day and night, and why is there day and night

Because all things in the world are dialectically unified, unity means that there must be one and two, so if there is white, there must be black; Dialectics refers to the fact that two opposing objects cannot exist at the same time, and the sun and the moon are precisely opposite, so the moon and the sun cannot appear at the same time, and there is also a day and a black sky

Completely rested!

Just like why there are men and women, why there are happy or unhappy, there are many reasons in the world waiting for us to discover

It's the same as why you have it.

Because the earth is rotating.

The earth is not suspended in the air, but in constant motion. Its motion can be divided into two types: one is its own rotation, which is called rotation; The other is to revolve around the sun, which is called revolution.

It takes 365 days for the Earth to orbit the Sun, and it takes one day for the Earth to rotate. As a result, there is always one side facing the sun and the other facing away from the sun on the earth; The side facing the sun is day, and the side facing away from the sun is night.

And I think the answer is wrong, because he asks why there is day and night.

Personally, I think that if you discuss this issue, then think about it first.

Chicken. Let's have eggs first.

I guess that's the power of the universe!

The rotation of the Earth is reason 1

The earth does not shine for reason 2

The self-shifting sidereal day is a day around 23h

56 minutes and 4 seconds, due to the existence of the yellow equatorial angle (the angle between the equatorial plane and the horizontal plane), the Arctic and Antarctic circles have polar day and polar night.

What you will learn when you study geography in the first year of high school.

You can borrow a geography book.

There is a diagram above. Cause.

1. The rotation of the earth (main tone).

2. The Earth is an opaque and non-luminous sphere.

The earth itself does not emit light and is opaque, and under the irradiation of the sun, the earth's surface is divided into day hemispheres and night hemispheres, and there is a difference between day and night in time.

The earth rotates every day.

Of course, there will be a cycle of day and night.

Because there is the sun and the moon.

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.

Because the earth rotates.

The discovery of the phenomenon of day-night depends on Copernicus's heliocentric theory: the earth revolves with the sun and rotates at the same time, which is a reasonable explanation for the phenomenon of day-night. 300 years after the heliocentric theory was proposed, a scientist named Foucault discovered the law of motion of the pendulum, which provided strong evidence for the heliocentric theory.

The earth rotates at the same time, and it takes 23 hours, 56 minutes and 4 seconds to rotate around in one revolution, and the revolution is about a degree, which is equivalent to 3 minutes and 56 seconds according to the speed of the earth's rotation, and the time, rotation plus the time taken to rotate is 24 hours. Longitude is every 15 degrees, and local time is one hour apart.

Why is the sun red? Why doesn't the moon come out during the day and only at night? Why are flowers red?

Why are trees green? Why are the days cloudy? Why do the seasons change?

Why does it rain? Why is it windy? Why does it snow?

Why does it turn cloudy in the morning or sunny in the afternoon?

Summary. Hello, after inquiry, there are two main causes of diurnal phenomena, the irradiation of light (such as sunlight) and opaque celestial bodies. Because the earth is opaque, sunlight can only illuminate half of the earth at any given time, which is day, and the other half that does not shine is night.

Hello, after inquiry, there are two main causes of the diurnal phenomenon, the irradiation of light (such as the sun's rays) and opaque celestial bodies. Because the earth is opaque, sunlight can only illuminate half of the earth at any time, and the sun is day, and the other half that cannot be illuminated is night.

The rotation of the earth only forms a 24-hour alternating cycle of day and night on the earth, and it can be seen that the alternating cycle of day and night on many celestial bodies with different bridges is different, for example, the alternation of day and night on Venus is 116 days if calculated according to the number of days on the earth (i.e., a day on Venus is equivalent to 60 hours on the earth).