When the sun is close to people, and when is it far away

Close at noon, far away in the middle of the night.

1 question has a new one.

When does the sun come closer? When to stay away?

2011-02-22 |Share.

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Just as close. It's just that in the morning the sun has more scenery and the contrast is bigger (near), and at noon the sun is in the sky, there is almost nothing close to him, slightly smaller (far). And the sun is on the horizon in the morning, obliquely, and at noon it is direct, so it is hot at noon.

However, the sun varies from season to season. 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.

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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.

When is the sun close to us, and when is it far away?

The distance between the sun and us does not change in the morning or noon. Why does the sun look bigger in the morning than at noon? This is a visual error.

The same object appears large in a small group and small in a large group. The foil of the morning sun is the mountains and houses in the distance, and these objects are small in size, so that the sun appears large and mistakenly thinks that they are close to us.

When does the sun come closer? At the beginning of January every year, the Earth is at perihelion. When it comes to the summer solstice, stay away.

The sun is close at noon. 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 the distance between the Sun and the Earth is constantly changing in a year or even in 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.

From January to July, in half a year, the distance between the sun and the earth changed by 5 million kilometers (100 million kilometers minus 100 million kilometers), the daily change value was 10,000 kilometers, from morning to midday about 6 hours, a quarter of a day, and the change value of the distance between the sun and the earth was about 6,700 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, the distance from the earth to the sun is 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.