Affected by the new crown pneumonia epidemic, college, middle and primary school students across the country have not yet ushered in the opening of schools until around the May Day holiday, and many employers in various places have not completely returned to the normal working state before the Spring Festival.
Since people rarely go out during the epidemic, as soon as they go out, many people suddenly realize that the spring of 2020 has quietly slipped away from them! Slipped away! Slipped away!
In the spring of previous years, people feel more about the revival of all things, full of spring, and it is the best season to go out and enjoy the flowers and get close to nature.
For professionals, spring can let everyone take off the thick cotton down jacket, wear light spring professional wear or casual wear, is Mary, Vivian and David show the best season of social elite, workplace white-collar spirit, think about it are a little exciting!
However, the spring of 2020 suddenly made all this impossible.
The actual situation is that for the broad masses of the people in most parts of our country, many people have not worn new clothes for the New Year several times, and the beautiful spring clothes prepared for the resumption of work or school have not yet had time to wear them for two days. Otherwise, how can a hot word get it? (Every year people all over the country complain that spring and autumn are too short, the fixed format "why is the spring (autumn) day in ×× city so short", interested can ask for help)
What is even more tragic is that for many "houses" - people at home, sadness comes from the sky, taking off winter clothes can only wear summer clothes, spring clothes completely "living cabinet" isolation.
Summer has passed, and the summer solstice has not yet arrived. The weather is getting hotter and the days are getting longer. When I was in school, my geography teacher must have popularized why there are four seasons on earth, and the time of dawn in the year is not consistent.
It's just, can you still think about it now? Does the principle still make sense?
In fact, it is also simple to say, this is all the "disaster" caused by the tilt of the earth's axis!
1. Earth's axis: The Earth's POSE amplitude is 23.5°
The Earth's axis, the imaginary north-south axis, is inclined to about 23.5° with the plumb line. The Earth rotates around the Earth's axis every 24 hours; the Earth rotates at the same time as it rotates slowly around the Sun in a nearly circular orbit each year. If the Earth had not tilted away from the plumb line, the amount of solar energy received at a given latitude would have not changed during a year's rotation.
2. Summer is coming, will winter be far away?
However, because the Earth's axis is tilted, the highest position of solar incidence changes throughout the year. When the northern hemisphere tilts toward the Sun, the Sun's direct rays can reach as far north as 23.5° north latitude (Tropic of Cancer). This position of the Earth occurs around June 21, the summer solstice point in the Northern Hemisphere and the winter solstice point in the Southern Hemisphere. Around December 21, when the sun's direct rays reached near 23.5°9 S (Tropic of Cancer), it was the beginning of summer in the southern hemisphere and the arrival of winter in the northern hemisphere. At other times of the year, the Earth's position relative to the Sun directly causes the sun's rays to move from about 23.5° north to 23.5° south and back again. Around March 21 and September 21 (vernal and autumnal equinox), the sun's rays hit the equator vertically. That's why the seasons change.
3. Why don't you understand the darkness of the night during the day?
The tilt of the Earth's axis also means that the length of day and night changes throughout the year. Half of the earth is always exposed to light. But only at the equator, every day of the year is 12 hours. As the distance from the equator increases, so does the time of day or night, depending on whether the sun is directly north or south of the equator. In the northern hemisphere summer, the length of the day gradually increases from the Arctic Circle to the North Pole, reaching a maximum of 24 hours in the Arctic. During the same period, the length of the night time from the Antarctic Circle to the South Pole could eventually reach 24 hours.
With 24-hour summer days in the polar regions, it looks like there should be enough solar energy to take advantage of. However, because the sun's angle of incidence is extremely narrow (the sun's position in the sky is low), all solar energy is spread across the wide ground. In contrast, the combination of the 15° and 30° north and south latitudes, where the summer daylight hours are longer and the angle of incidence of sunlight is close to 90°, makes the two regions have a lot of energy available.
4. The angle is perfect
This tilt of the Earth's axis actually creates many benefits in the ecosphere of the Earth. First of all, there are more places on the earth where organisms can survive, there are far fewer absolutely cold areas on the earth, most of the surface of the earth is suitable for biological survival, and in temperate regions, there is a phenomenon of alternating spring, summer, autumn and winter, atmospheric circulation is more active and extensive, and water vapor and rainfall are also more evenly distributed, which is undoubtedly conducive to the survival and reproduction of organisms on the earth. If the Earth is not tilted, then the Earth's biosphere will be much smaller. For the broad masses, it is not simply a problem of short spring and autumn and long winter and summer, it is very likely that there is only one season a year, and the problem is big.
For most of the white-collar workers who have been devastated by 996, if there is a book that is not difficult to read after dinner, or even a very interesting popular book on geography, to help us systematically recall the teachings of the geography teacher, and apply the relevant knowledge to daily life, and give us answers, wouldn't it be good? Geography and Life is such a book, and the questions related to geography can easily find satisfactory and authoritative answers from it, which can be called a must-have for home travel.