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Anonymous users2024-02-11It is the result of the rotation of the earth around the sun. The side facing the sun is day, and the side facing away from the sun is night.
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Anonymous users2024-02-10Because where there is the sun and the earth, there will be day and night.
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Anonymous users2024-02-09The daytime is what makes us a group of people nervous, and at night, we can rest when we are tired
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Anonymous users2024-02-08The 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 part of the earth that receives the sun's heat 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 the constant alternation of day and night. When children face the sun, your face is day, the back of your head is night, at this time, your nose is noon, your right ear is morning, and your left ear is evening.
As it rotates to the left, the left hand enters the night, the nose enters the evening, and the right ear becomes the noon ......When your face is facing the sun, a day and night pass.
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Anonymous users2024-02-07Because at night the sun has to rest.
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Anonymous users2024-02-06The New York Museum of Natural History displays many rare specimens from all over the world, and these specimens actually have a shocking secret, that is, when night comes, all the specimens in the museum will come to life. For more knowledge content, welcome to pay attention to WeChat*** Science Travelogue.
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Anonymous users2024-02-05The distinction between day and night that we see is due to the rotation of the earth. The Earth is an illuminated, opaque sphere, and it is constantly rotating in a permeable state, 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.
This creates day and night.
And 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, there will also be a phenomenon that the sun does not set or does not come out all day long, that is, 24 hours a day is day or night, which is the phenomenon of "polar day" and "polar night" in the polar region.
The cycle of day and night, which is the time interval between the sun passing through the same meridian twice in a row, is called a solar day. The solar day restricts human daily life and rest, so it is used as the basic unit of time.
In addition, the short duration of the solar day makes the entire surface of the earth heat and cool not to be excessively violent, thus ensuring the survival and development of living organisms on the earth.
The rotation of the earth produces a diurnal cycle; The Earth's revolution produces seasonal changes. Since the earth is an opaque planet, the sun and stars give the earth light, and the side that shines on the sun is day and the other side is night. The earth is constantly rotating from west to east around its axis of rotation, and the phenomenon of celestial bodies rising in the east and setting in the west is a reflection of the earth's rotation. >>>More
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 >>>More
It's because of gravity.
At the beginning of the formation of the universe, there were no stars, when the whole universe was a diffuse hydrogen cloud, and later due to some small density imbalances in the hydrogen cloud, some areas with higher density gradually gathered and collapsed under the action of gravity, and finally formed a spherical star under the action of gravity, and its core part produced nuclear fusion under the action of huge gravity, releasing huge energy while forming substances with high atomic numbers such as helium, thus producing the first stars. During the combustion of massive stars, the fusion reaction of their inner cores is upgraded layer by layer, synthesizing carbon, oxygen, silicon, iron and other elements, until the end of its glorious life in the form of a supernova explosion. The enormous energy released during the supernova explosion further synthesized a variety of chemical elements with a higher atomic number than iron, which were erupted into the universe to form nebulae and gradually enriched over a long period of time, and some parts of the fragments of dead stars were concentrated to form new stars and/or galaxies under gravitational attraction, in which areas rich in heavy elements formed solid planets like the Earth, and life evolved under the right conditions, which is why we exist. >>>More
Bad breath is a common clinical symptom caused by many diseases, usually the cause of bad breath, mainly caused by diseases in the mouth, or due to diseases of the digestive tract, such as indigestion, gastrointestinal digestive disorders or due to respiratory diseases, which can lead to bad breath. Therefore, we should pay attention to maintaining a healthy lifestyle and eating habits, keep the mouth clean and hygienic, brush our teeth frequently, pay attention to a light diet, and eat more fresh fruits and vegetables.
All human beings are born with the instinct of faith, and when people are desperate, they will shout to me, oh my God, who can help me. Man needs water and food to live, and so does the human spirit, which needs rest and spiritual food for the soul. I suggest you look at the Bible.