The sun is close in the morning, or the sun is close at noon

If a person is on the equator, then the distance from the sun at night is exactly one more diameter than the distance from the sun at noon during the day.

From this, it can be concluded that the sun at noon is closer to people than the sun in the morning, which can be calculated from the Pythagorean theorem.

In fact, the sun is at the same distance from us in the morning or at noon. What should be taken into account is the angle at which the sun's rays hit the earth.

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

The temperature is higher at noon than in the morning, is the sun closer to us at this time than in the morning? Neither is it. The main reason is that the sun hits the earth obliquely in the morning and the sun shines directly on the earth at noon.

At the same time and in the same area, direct radiation is higher than oblique heat. At the same time, at night, the heat of the sun shining on the ground dissipates, so it feels cool in the morning; At noon, the heat of the sun hits the ground, so it feels hot. The temperature is hot or cold, and it does not indicate how far or near the sun is from the ground.

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 for about 6 hours, a quarter of a day, and the change value of the distance between the sun and the earth was about 6700 kilometers, which was greater than the radius of the earth.

If the Earth is moving towards perihelion, from morning to noon, 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 6,700 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 a 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 6,700 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 the specific problem and specific analysis.

In the same way, the earth orbits around the sun, and the radius of the orbit is the same, so the sun in the morning is as close to the sun as the sun at noon.

Isn't this the content of the textbook "Two Children Distinguish the Day"? Of course it's the same.