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This is because there are no clouds during the day, the sun shines on the ground, and the temperature rises rapidly, with the highest temperature appearing at 14 o'clock to 16 o'clock. After sunset, also because there is no cloud cover, the ground dissipates heat quickly and cools down quickly. After sunrise, the ground regains sunlight, so the lowest temperatures mostly occur around sunrise.
In addition, in the fall, dress according to the cloudiness of the day and night. On a sunny day, the temperature will rise significantly during the day and the temperature will drop significantly at night. On rainy days, the temperature does not rise significantly during the day, and the temperature does not cool down significantly at night. Therefore, when it is sunny, you should dress more in the morning and evening in autumn, and you can reduce your clothes at noon.
On cloudy or rainy days, the temperature fluctuates less due to the cloudy cover, so there is no need to change or decrease the amount of clothing in the morning, evening and noon.
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The temperature of the ground and the angle of the sun's rays at the time of day are related to the angle between the ground level, which is the angle of the sun's altitude.
Generally, at 12 noon, the solar altitude angle reaches its maximum, but the heat at this time will be released at about 13 o'clock, so this time is the hottest, and at four or five o'clock in the morning, the sun radiates.
The heat is at its lowest, so this is the coldest time.
The Earth's orbit around the Sun is an ellipse that is close to a perfect circle, and the Sun is located at a focal point of the elliptical orbit, so that in a year, or even in a day, the distance between the Sun and the Earth.
It's all in constant flux.
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Because, you are the only one watching it, as long as there is a person you like by your side, even if he or she doesn't like you, you will feel warm
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The temperature of the ground and the sun's rays in a day are related to the angle of the ground level, that is, the angle of solar elevation, generally at 12 o'clock at noon, the solar altitude angle reaches the maximum, but the heat at this time will be released at about 13 o'clock, so this time is the hottest, and at four or five o'clock in the morning, the solar radiation heat reaches the lowest, so this time is the coldest.
The Earth's orbit around the Sun is a nearly circular ellipse, and the Sun is located at a focal point of the elliptical orbit, so that the distance between the Sun and the Earth is constantly changing over the course of a year or even a day.
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The heat and coldness of the weather are mainly determined by the temperature of the air.
The main factor influencing the air temperature is determined by the intensity of solar radiation, however, solar heat is not the main reason for the direct increase in air temperature, because the heat energy of various gases in the air that directly absorbs sunlight is only about 14 in total, and about 43 is absorbed by the ground. After the ground absorbs the heat of solar radiation, it is then transmitted to the air through radiation, convection, turbulence, etc., and the result of this upward heat transfer is the main reason for the increase in temperature.
Therefore, the increase in ground temperature is mainly the result of absorbing solar radiation energy. When the sunlight hits the ground, it heats the ground, and the heat absorbed by the ground is released to warm the air, and the air temperature is indirectly obtained from the ground. Therefore, after the ground is heated, it will take a while for the temperature to rise.
Although at noon in summer, the sunlight hits the ground closest to direct rays, and the ground and air are the most heated, but after noon, the heat released by the ground is still less than the heat of the sun, so the ground temperature can continue to rise. Wait until the heat emitted by the ground is equal to the heat of the sun, and the ground temperature rises to the maximum; The increase in the temperature near the ground must be obtained by the heat released from the ground, and it all takes time, so the hottest time in summer is not noon, but at two or three o'clock in the afternoon. In the same way, after the sun goes down, it loses the heat of the sun, therefore, it begins to lose heat continuously, and the temperature continues to decrease, and in the early hours of the morning, the ground temperature drops to the lowest value, so the temperature is the lowest at this time.
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The sun rises, because there is a night of cold, and although there is sun, the ground is still cold. At sunset, although there is no sun, there is still a day's radiant heat from the sun on the earth.
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Because it has been cooling down before sunrise, it is the coldest around sunrise.
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To put it simply... Surely the nights are colder than the day? == (This is nonsense).
Then the key is to compare. It's the temperature in the middle of the night and early in the morning...
The so-called around sunrise. It was when the sun first came out ... Studied physics.
I know it. The specific heat of the air is greater than that of the earth. To put it simply.
It's that the earth heats up and cools more easily than the air. When the sun comes out. The earth and the air increase heat at the same time.
But the earth starts to heat up earlier than the air, and warming requires the absorption of heat. The heat of the air is absorbed by the earth. When the heat given by the sun is less than the amount of heat absorbed by the earth, the temperature of the air drops until it reaches the lowest value of the day, and the air temperature is the temperature we usually feel...
Of course, when the sun rises again, the air absorbs more heat than it absorbs to the earth, and the air begins to heat up... Similarly. You can extrapolate the other way around, the hottest sun is 12 o'clock, but the highest ground temperature is 13 o'clock.
And I feel that the highest temperature is generally 14 o'clock. . .
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During the day, the earth is irradiated by the sun's rays to absorb and store a large amount of heat, and after the sun sets, there is no heat source, and the air temperature decreases, so the hotter earth begins to dissipate heat into the air, and the earth has been dissipating heat at night. Around sunrise, before the earth has absorbed new heat, a lot of heat has been released after a night, so the temperature is at its lowest.
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During the day, the ground absorbs the heat of the sun, and the temperature is highest at about two o'clock every day, and at night the ground emits heat outward, and until the sun comes out the next day, because it has been emitting heat, it is coldest around sunrise, and repeats this after sunrise.
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Before sunrise, the sun's rays do not shine on the earth because the sun does not come out, so the earth is cold before sunrise. After the start of sunrise, the earth slowly heats up, but the sun is always very low because the solar angle with the earth's surface is close to zero degrees (horizontal), and because it takes a certain amount of time for the earth's ground to increase the annual heat, the sunrise is colder. After sunrise, the sun shines on the earth for longer and longer, the ground is particularly hot in the afternoon because there is plenty of time to heat, and then sunset, also because the angle between the sun and the earth's surface is close to zero, the sun's sunlight is softer and more flexible, so sunset means that the temperature slowly decreases, and it takes a certain amount of time for the object to change temperature, so the earth is still hot at sunset, and then slowly dissipates heat, so it is much hotter than at sunrise!!
Be. Morning: 00 The scariest I did a parttime. One to 4 o'clock.
It's freezing and calling for help.
Because the sun is hot and hot, it is warm at sunset, but it is frozen at night, so the sunrise is heavily frozen.
Reference: me
Because after a night.
The heat absorbed by the surface during the daytime has been lost.
Zero morning four. Five o'clock is the freezing.
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The right amount is effective. It excites your nerves.
Reason: Evolved from the ancient Roman Julian calendar.
Caesar decreed in his decree to change the calendar that there should be a leap year every three years, that is, a leap year every four years; 365 days per year in a normal year and 366 days a year in leap years. At that time, the 365-day month arrangement of the ordinary year was completely in line with human thinking, that is, according to the big month, the small month, the big month, the small month, the big month, the small month, the small month, the big month, the small month, the big month, the small month, the big month, the big month, the small month, the big month, the small month, the big month, the big month, the small >>>More