What time of day is the Sun closest to us? Please, 3Q

Over the course of the year, the Earth is at perihelion on January 2 and aphelion on July 5. During the period when the Earth moves from perihelion to aphelion, the Sun is farther than sunrise at noon, 1,000 kilometers in early February and 6,400 kilometers in early April. When the Earth moves to aphelion, this difference disappears.

Conversely, as the Earth moves from aphelion to perihelion, the Sun is closer than sunrise at noon, nearly 5,800 kilometers in mid-July and 16,000 kilometers in mid-September, when the difference disappears again until perihelion. And so on year after year, never stopping.

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. At the beginning of January every year, the Earth is at the perihelion of its orbit around the Sun, and the distance between the Sun and the Earth reaches a minimum value, which is about 100 million kilometers. At the beginning of July every year, the Earth is located at the aphelion point of its orbit around the Sun, and the distance between the Sun and the Earth reaches its maximum value, which is about 100 million kilometers.

Compared with the average distance between the Sun and the Earth (100 million km), the difference in the distance between the Sun and the Earth in one year (100 million km) is almost negligible. Then in a single day, the change in the distance between the sun and the earth is even more insignificant. If you had to compare the distance between the sun and the earth in the morning and at noon, one would think that the sun at noon would be closer, because the morning sun shines from the horizon and is a distance of the radius of the earth than the sun at noon.

Whether this statement is correct or not, let's analyze it. From the above data, it can be seen that from January to July, in half a year, the change range of the distance between the sun and the earth reached 5 million kilometers (100 million kilometers minus 100 million kilometers), the change value in each day was 10,000 kilometers, from morning to noon about 6 hours, for a quarter of a day, and the change value of the distance between the sun and the earth was about 6868 kilometers, which was greater than the radius of the earth. If the Earth is moving towards perihelion, from morning to noon, on the one hand, it is indeed closer to the distance of the Earth's radius (more than 6,300 kilometers), and on the other hand, after a quarter of a day, the distance between the Sun and the Earth is also 6,868 kilometers.

But if the earth is moving towards aphelion, from morning to noon, on the one hand, from the earth to the sun is also close to the distance of about a radius of the earth (more than 6,300 kilometers), but on the other hand, after a quarter of a day, the distance between the sun and the earth is 6,868 kilometers, and the two are superimposed, and the noon is even farther from the sun. Therefore, whether it is closer to the sun at noon or closer to the sun in the morning depends on what time of year it is.

The closest time of the day the Earth is to the Sun is 12 noon, and the farthest time is in the early morning. The farthest point of the year from the Sun is January, and the closest is July.

The sun looks bigger in the morning than at noon, is it that the sun is closer to us in the morning and farther away at noon? No.

Under certain conditions, people will have the illusion of seeing objects, an object will appear larger in the middle of some small objects, and an object will appear smaller in the middle of some large objects.

In the same way, the sun in the morning is backed by trees, houses, etc., and at noon, the sun is overhead, and the sky is extremely large overhead, so it seems that the noon sun is smaller than the morning sun.

Also, we look at a white figure that is larger than a black figure of the same size. This is called "photoosmosis" in physics. When the sun rises, the surrounding sky is dark and dark, so that the sun appears bright, and at noon, the sky is bright, and the difference between the brightness of the sun and the backing is not so great, which is why it seems that the sun is bigger in the morning than at noon.

In short, the sun is at the same distance from us in the morning and at noon, so its size is the same, and it seems that the sun is bigger in the morning than at noon because of the illusion of the eye.

Also, is it because the sun is closer to us at noon than in the morning? Neither is it. So why?

Noon is hotter than morning because the sunlight is directly on the ground at noon, and the morning sunlight is obliquely on the ground. So noon is hotter than morning.

In fact, the heat and coldness of the weather are mainly determined by the temperature of the air. The main factor affecting the air temperature is determined by the intensity of the sun's radiation, but the solar heat is not the main reason for the direct increase in air temperature. Because the heat energy directly absorbed by the air into the sunlight is only a small fraction of the total heat energy of solar radiation, most of which is absorbed by the ground.

The ground absorbs the heat of solar radiation, and then conducts it upwards to the air through heat transfer methods such as radiation and convection, which is the main reason for the increase in temperature.

In short, the fact that the sun is hot at noon and colder in the morning is not because the sun is far or near our earth.

The sun is the same distance from the earth in the morning and at noon.

The reason for this is that the Sun is about 6,400 kilometers away from us (i.e. the radius of the Earth), but this difference is insignificant compared to the distance between the Earth and the Sun (about 150,000,000 kilometers from the Earth), so the Sun in the morning and at noon can be said to be almost the same. Why does the sun look bigger in the morning than at noon?

It's a visual error, an illusion. The same object, placed in a group of objects larger than it, appears small, while placed in a group of objects smaller than it appears large. In the same way, the morning sun rises from the horizon against the backdrop of trees, houses, distant mountains and a small corner of the sky, and in this comparison, the sun appears larger.

At noon, when the sun rises high and the vast sky is the backdrop, the sun appears smaller. Secondly, the white part of the same object appears larger than the black one, and this physical phenomenon is called "photoosmosis". When the sun is rising, the background is a dark and dreary sky, and the sun is exceptionally bright; At noon, the background is a blue sky, and the sun does not contrast much with its brightness, so it appears smaller.

Assuming your latitude is the same, if you are in the 8th time zone East, the Sun will be closest to you at 12 o'clock Beijing time. If you are in the East 7th District, the sun is closest at 13 o'clock Beijing time. If you're in Zone 6, you'll be closest to the sun at 14 o'clock Beijing time. And so on.

The afternoon is closest to us and the morning is the farthest from us.

The first thing to do is what season it is.

The second depends on where you are on Earth.

Hello landlord.

The closest season to us is generally in the spring and summer periods.

This is the perihelion of the Earth's motion around the Sun.

But noon is when the sun shines directly on us.

In other words, the noon sun is closest to us at different times compared to the unified region.

It's almost close to the middle of the day, and it's hot at noon because the sun hits the earth directly, but it's closer to us in winter.

For you, there is almost no need to consider the distance, the visual size of our temperature of a day or a year, the size of the nuclear sun, has nothing to do with the distance, it is caused by the change in the angle between the equator and the ecliptic during the rotation of the earth and the revolution of the earth.

The factors that determine the temperature in winter and summer are the direct and oblique rays of the sun. In winter, January 3 is the closest day the sun is to the earth, but at this time, the sun obliquely hits the northern hemisphere where we live, so the northern hemisphere is still winter, and the southern hemisphere is very hot because of the direct sunlight.

In the summer of the Northern Hemisphere, July 4 is the day when the Sun is furthest from the Earth, but at this time the Sun shines directly on the Northern Hemisphere where we live, so it is hot in the Northern Hemisphere, and it is winter in the Southern Hemisphere.

The Earth's orbit around the Sun is an ellipse that is not much different from its long and short diameters, and can be approximated as a perfect circle. The sun is at one of the focal points of this ellipse, and the focus is not in the center of the ellipse, so the distance between the earth and the sun is sometimes a little closer, sometimes a little farther away. At the beginning of January, the Earth is closest to the Sun at 147,100,000 kilometers, which is called perihelion.

At the beginning of July, the Earth is farthest from the Sun, at 152,100,000 km, which is called aphelion. In fact, when the Earth is at perihelion, it is winter in the northern hemisphere and summer in the southern hemisphere, and summer in the northern hemisphere and winter in the southern hemisphere at aphelion.

Early January (PerihelionThe angular velocity is 61 minutes a day.

Linear velocity in kilometers and seconds.

At the beginning of July (aphelion), the distance is 100 million kilometers, the angular velocity is 57 minutes, and the antenna speed is kilometers and seconds.

On January 22nd, the Earth is closest to the Sun.

Throughout the year, the Earth has perihelion in winter and aphelion in summer. In most parts of the globe in one day, most seasons, the sun is closest to the ground at noon.

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