Qin Emperor Ying Zheng looked at the ecliptic, equator, vernal equator, and autumnal equator are constantly in confusion. If the ecliptic and equator lose the function of positioning the stars, why is the meaning of spending so much effort to do this?

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The more Qin Emperor Ying Zheng thought about it, the more unwilling he felt. He tried to determine the position of the sun. As we all know, the sun rose and set in the east. If someone asked which direction the sun was, everyone would blurt out, the sun was in the west!

But in fact, because of the direction of the earth's rotation, the sun rises from the east (except for the North and South Poles, polar day and polar night will occur). However, the earth is still rotating, which also causes seasonal changes.

, so whether it is the east is also affected by this factor.

First of all, the influence of the seasons. China is in the northern hemisphere. In summer, the sun moves to the Tropic of Cancer. Therefore, people in provinces on the Tropic of Cancer can feel that the sun rises from the east and people who are close to the equator in Hainan Island.

You will feel that the sun is rising from the northeast.

In addition to seasons, it is also related to region. In some places, such as Heilongjiang Province in our country, we will not see the sun rising from the east, but in the southeast direction, because the sun moves between the Tropic of Cancer and the Tropic of Cancer, the most important thing is

It only reaches the Tropic of Cancer, but it cannot reach Heilongjiang Province.

Therefore, in our cognition, the position of the sun is not the exact position of the sun, and the earth's orbit around the sun is not a standard prototype but an elliptical shape.

The center position of the earth's revolution is not the center of the sun, but the public mass center of the earth and the sun. Not only is the earth rotating around the public mass center, but the sun is also rotating around the point. However, the sun is the central body of the solar system, the earth

It is just an ordinary planet in the solar system. The mass of the sun is 330,000 times that of the earth. The public mass center of the sun and the earth is only 450 kilometers away from the center of the sun. This distance is compared with the radius of the sun, which is about 700,000 kilometers.

It is really insignificant, and it is even smaller than the distance between 150 million kilometers of the sun and the earth. Therefore, the Earth's revolution is regarded as the movement of the Earth around the center of the Sun, which is very close to the actual situation, but it is not the most accurate. The Earth

Two points will be formed on the orbit around the sun, perihelion and arihelion. When the earth reaches the arihelion, the direct point of the sun is on the Tropic of Cancer. Our summer is defined based on the positional relationship of the arihelion at the arihelion.

of……

Then a new question is here, how to determine the Tropic of Cancer...

Qin Huang Ying Zheng felt that he was going crazy. He was like a student now, madly making up for geography knowledge. He understood the fear of primary school students being dominated by homework!

He is at most a top academic level in the field of astronomy and geography. Even professional astronomers can not draw out the hobbies of Qin Huang Ying Zheng, such as the plan of the stars in the sky.

If it weren't for the many people watching in the hall of Qianjin Building, Qin Emperor Ying Zheng would have wanted to pull his hair to relieve his depression.

Not only that, even if he can determine the Tropic of Cancer, he cannot solve the problem of direct sunlight. The bigger problem is still behind. The earth does not remain unchanged. It has been orbiting the sun and the maximum distance between the sun and the earth is 15    2.1 million kilometers.

(The earth is at the ahelion); the minimum value is 14   7.1 million kilometers (the earth is at the perihelion).

The distance between the two also floats between 15210 and 14710. If you want to determine the position of the sun through modern methods, it is far from enough to have only one coordinate on the earth. It also needs a second or even more star coordinates to be assisted.

But the small Zhoutian formation was a killer formation that Qin Emperor Ying Zheng had to complete. Therefore, Qin Emperor Ying Zheng could not easily give up the plan to arrange the star formation because of this setback.

Now that Qin Emperor Ying Zheng has no choice but to think of other ways...

As long as people are willing to work hard, there are always more ways than difficulties. Since modern science cannot be used to determine the position of astrological constellations, Qin Huang Ying Zheng was increasingly impressed by the ancient secrets. Those people were truly cruel people, without the assistance of precision instruments now.

In ancient times, the stars in the sky could be distinguished by a pair of naked eyes. Now, after the Qin Emperor Ying Zheng experienced many setbacks, he admired those secret scholars more and more. In his opinion, it was an unimaginable thing.

Therefore, Qin Emperor Ying Zheng decided that modern methods would not work, so it is better to try ancient methods. At some point, modern methods may not be more advanced than ancient methods, such as the current situation...

The sun and the moon follow the ecliptic, the south reaches the Qianniu, and the north reaches the east well. The sun travels once a day, and the moon travels thirteen degrees and nineteen degrees. Now the historian takes the equator as the magnitude, and does not travel the same as the sun and the moon.

The fighting, the ox, (Dongjing), the chariot, the equator is fifteen, and the ecliptic is thirteen and a half degrees;... The technique of the sun and the moon follows the ecliptic, and the moon follows the nine paths. With the equatorial qualities, the sun and the winter solstice

When you go to the extreme, you will reach the end of the horoscope. When you enter the lobby, the equator is in the twenty-one Dou Dou, and the ecliptic is in the nineteen Dou Dou. The two qualities are in the nineteen Dou, and the two qualities are in the same direction. The movements of the sun and the moon are different, so that the moon moves forward and retreat. Therefore, the moon moves.

Wells, oxes, and above fourteen degrees, and they are in horns, lou, and above twelve degrees. "That is, for the moon, the celestial body, based on the ecliptic and the equator, "strings and hopes

"The date and operation speed are different. The same is true for the determination of other celestial bodies.

This is an ancient method of measuring the moon, that is, the moon, and it is also applicable to other stars. Qin Huang Ying Zheng originally wanted to use this method to guess the location of the twenty-eight constellations, but after he understood this thoroughly

He suddenly changed his attention. It was much easier to use the ecliptic equator to determine the position of the moon than to use the ecliptic equator to determine the position of other stars. After all, the moon is closest to the earth!

Qin Emperor secretly laughed in his heart that he was blinded by a leaf, and always felt that modernity was good and advanced. He wore tinted glasses to see ancient things, and always felt that ancient things were backward. Now, he looked at them, and there were no ancient things.

If you have to, you will definitely fall behind. A black cat and a white cat are the best cats to catch the mouse! No matter who is good in ancient times, who can choose whom he wants, Qin Huang Ying Zheng is undoubtedly a pragmatist, and the law of true fragrance since ancient times!

So, Qin Emperor Ying Zheng changed from speculating on the twenty-eight constellations to speculating on the position of the moon.

The strict definition of the eclipse is: the large circle where the instantaneous average orbital plane of the center of mass of the earth and moon system revolves around the sun and the celestial sphere intersects. The eclipse is the base circle of the eclipse coordinate system on the celestial sphere, which is the fundamental origin of the celestial coordinate system on the celestial sphere, which is the fundamental origin of the positioning and dividing other stars on the ground.
Chapter completed!