Can anyone help me with my questions about the sun?

I remember that there was a map in my junior high school textbook, which was a map of the change in the height of the sun and the length of day and night at noon on the 2nd equinox solstice in the 40 degrees north latitude, with directions marked on it.

Because the earth is tilted to face the sun, and the earth's axis is always inclined in one direction, when the earth rotates, the sun will move back and forth in the Tropic of Cancer, and when it is directly hit the Tropic of Cancer, the angle of the earth's tilt can make the entire Arctic Circle be irradiated by the sun, which is why the sun rises in the northeast

Sun Sunday Vision**.

1.The apparent motion of the sun is what people perceive as the sun rises in the east and sets in the west.

2.To determine the point of the sun, you need to measure the angle between the sun and the ground level at noon, then find the latitude of your place from the map, and then apply the formula directly. The formula is that the height of the Sun at noon is equal to 90 degrees minus the difference between the local latitude and the direct point of the Sun.

3.The date is a bit tricky to calculate, but it can be approximated

The Sun can move north (south) every day and is on the equator on March 21 (September 23). This allows us to rewind the date based on the distance of the Sun from the equator.

4.The observer's position with the Sun can be measured in terms of angles, such as the angle to the ground level and how many degrees to the east (west).

The sun always emits light and heat, and if water of the same mass is poured on the sun, will it be extinguished? No, it won't. The exposure of the sun is necessary for all living beings on earth, and since ancient times, the sun in human history has been in a more sacred position, and in various mythological stories, the sun is also in the position of God.

<> with the advancement of science and technology, human beings have gradually realized that the sun is a much larger star than the earth, which can shine like a very large "fireball" The birth of the sun has been nearly 500 million years, and in terms of lifespan, the sun can exist for at least another 5 billion years. On Earth, we will see the fiery, blazing sun that has accompanied the Earth for 4.6 billion years. The years bring light and warmth, and bring the breath of life.

Without care for the sun, the earth would not have been able to create beautiful ecosystems or the birth of life, the birth of humanity.

In a sense, the sun is the mother of all life on earth, and the ancients did not know much about the sun, except that it was a fireball, and that nothing was known about its fuel pattern, as well as its mass, etc., and many myths about the sun were born in this regard. After a person is born, he is very curious about the sun, because in ancient times, people lacked scientific and technological knowledge of the concept, and naturally did not know what the Peixin sun was, but only knew that it could burn light and heat.

It wasn't until mankind entered the age of science and technology with astronomical telescopes that we learned that the sun was originally a star, and there are at least 100 billion stars in the galaxy of stars like this. The sun can burn, so someone came up with the bold idea that such an option is possible when water as heavy as the sun hits the sun to achieve its purpose, to extinguish the sun? If the water sprinkled in the sun is as heavy as the sun.

The sun itself is not "fire", at least not the kind of flame we find on Earth. The Sun has a very different fuel** that makes it the core of the solar system. The fuel process is nuclear fusion.

Simply put, nuclear fusion is the combination of hydrogen atoms to form helium atoms under high pressure. Let's start by reviewing the fundamentals of nuclear fusion.

The volume of the sun is 1.3 million times that of the earth, the central celestial body of the solar system, and an ordinary star in the Milky Way, the sun is 100 million kilometers away from the earth, with a diameter of 1.39 million kilometers, and it takes 3,500 years to walk from the earth to the sun, and 20 years to sit even if you take a plane.

The sun is one, the earth is round, the climate is uncertain, and there is also the influence of the morning and dusk line.

You don't even know about this question - -

The sun's rays shine on the earth, during the day ... The sun and wood have moved. In fact, you can't see the sun because the clouds block it.

And if you can't see the sun in the United States. It is because of the alternation of day and night in the rotation of the earth.

Look at the weather forecast and you'll understand, or go to elementary school to popularize science.

In summer, the sun rises in the northeast and sets in the northwest, and in winter, the sun rises in the southeast and sets in the southwest, and only on the two solstices does it rise and set in the east and west, which is normal in the eyes of our astronomy enthusiasts.

The change in the direction of sunrise should be noticed by many people, because the sun shines on the northern hemisphere in summer, so the sun is northerly at noon, and it is also northerly at sunrise and sunset; In winter, on the contrary, it is normal for noon to be southerly and sunrise and sunset to be southerly. Moreover, the whole earth is the same, and we see the sunrise in the northern hemisphere to the north, the southern hemisphere, and the equator, and those who are familiar with the celestial sphere will know this.

It should be easier to understand with illustrations.

Because after the vernal equinox (March 21), the direct sunlight point is located in the northern hemisphere, and it continues to move north, so the solar altitude angle in the northern hemisphere is larger, and when we look at the sun, we feel that it is overhead, and on the day of the summer solstice (June 22), the sun in northern Anhui is the northernmost point of the year, so we can see the sun from the north side of the house.

After the summer solstice, the direct point of the sun moves south, so in winter we look at the sun and feel that the sun is in the south. On the winter solstice (December 22), the solar elevation angle in Anhui reaches the lowest value of the year, and the ground floor may not be illuminated by the sun.

Sunspots are cooler than flares, so they appear "black" against the background of the sun, but in fact they emit afterglow. When sunspots are active, the intensity and speed of the solar wind increase correspondingly. Flares are closely related to sunspots, and on large sunspot groups, flares are easy to occur.

Sunspots are generated because the Sun's complex magnetic field prevents hot matter from entering this region, and its location is also the Sun's high magnetic vertical field. Magnetic storms are also generally found in areas with high magnetic fields.

Sun Fundamentals.

Radius cm.

Quality grams. The average velocity of grams3 of the surface is accelerated by gravity.

Centimeter sec 2 escape velocity 618 km sec spectral type g2v

The total radiation of Erg seconds absolute visual magnitude +

Visual magnitude Effective temperature 5770k

Chromatic index (b-v)+

The period of the conjunction of the rotation of the Sun (days).

is the latitude of the center of the solar garden surface).

The solar constant (the total amount of solar radiation of all wavelengths received in one minute outside the Earth's atmosphere, one astronomical unit from the Sun, perpendicular to the direction of the speed of light of the sun, in one minute) is stuck in centimeters 2·min.

kW2).

The brightness distribution of the Sun's surface decreases sharply outside the edge, e.g. at wavelength 50000, at 2% of the radius of the Sun at the edge, it decreases to 42% of the central intensity

The so-called sun rising in the east and setting in the west is an intuition or an illusion - taking the earth as a reference, the sun revolves around the earth;

The fact is that the Earth's rotation is like a worm, from west to east, (aside, assuming the Sun is stationary) and is buried late;

If the airplane flies from east to west, it is equal to letting the tan be in the opposite direction of rotation, and the flight speed is greater than the rotation speed, it will cause another mistake.

Jue – The sun rises in the west (sets in the east).