What do you mean, water meets the sky?

The place where the water meets the sky is the scene where the sky meets the water. The place where the water meets the sky is a very bright gray-white line called the horizon.

Horizon is a geographical concept, which refers to the dividing line between the ground and the sky. More precisely, the direction that people can see is divided into two classification lines: one intersects with the ground and the other does not.

In many places, the real horizon will be covered by trees, buildings, mountains and so on. On the contrary, the horizon is visible. However, if you are on a ship in the sea, you can easily see the real horizon, that is, the line where the sky intersects the ground. Historically, the distance between people and the visible horizon is very important, because it represents the farthest distance that human beings can communicate and meet before the transmission of radio waves and the invention of telegrams. Even today, when the plane flies under the rules of visual flight, the pilot has a skill called visual flight to control the plane, which is to control the plane by using the relationship between the tip of the plane and the horizon. It also performs spatial positioning according to the horizon.

In astronomy, the horizon refers to the ground plane seen by the observer. It is the basic plane of the horizon coordinate system, and the orbit of its upper point has zero horizon latitude. Just like the geometric horizon mentioned above, the horizon in astronomy can be regarded as a plane in space, not a line on the map.

When standing on a plain, a tower or a hill surrounded by a plain, the distance from the horizon is about

Kilometers, h is the vertical distance from the eyes to the ground.

Example:

Then on the plane, h = 1.70, 4.7km from the horizon.

Standing on the hill or tower, the height is 100 meters, 36 kilometers from the horizon.

These figures show people's theoretical visibility on the ground level (of course, it will also change due to the clarity of the air). When calculating the distance from the top of the tower, because the mast or hill of the ship is on the horizon, it is necessary to add the horizontal distance generated by its height. For example, standing on the ground, h = 1.70 meters. If weather permits, people can clearly see the top of the tower with a height of 100 meters at a distance of 4 1 km from the tower.

Here is an article about the horizon.

I came to Weibei Plain from Qinling Mountains, and I like to run freely on the road by bike. The crops have been harvested and there are not many pedestrians. On the empty Yuan Ye, some trees and low houses are scattered. Almost as soon as I looked up, I saw the distance. The sky and the earth are connected. Heaven and earth are no longer parallel, but form a triangle. At the crossroads, there is a bright gray-white line, where the trees lie. ?

"Ah, today is over!" I ran towards the bushes as fast as I could. After riding for a long time, I rushed under the tree, but the world was still parallel; In the distance, there is a low house, where heaven and earth meet, and the bright gray line appears again.

"An old man came and his beard floated on his chest, in no hurry. ?

"Father, are you from the horizon?" I asked. ?

"the horizon?" ?

"That's a very bright gray line. Is it far to go there? "

"Son, that's the horizon that can never be reached." ?

"What is the horizon?" "Is it a mystery?" ?

I don't quite understand. I thought he was lying to me, so I ran to the low house on the bright gray line. However, I failed: the sky and the earth were parallel in the low house, and the horizon appeared in the distance. ?

I sat on the ground, chewing the old man's words and thinking about this horizon, which is really a mystery. It is precisely because this is a mystery that I want to solve it and run such a journey. Is it always a mystery to attract me and people with the same interests to understand it?

From then on, I grew up day by day and set foot on the society. The boat of life sails to the sea of life. But I remember this horizon, my life has not sunk, although there are hardships, pains and loneliness. Fate and ideal are like parallel between heaven and earth, but they always cross. The bright gray-white lines that are highly integrated and unified will always attract you to walk ahead. Always pursue the horizon and solve this mystery, and life will be full of freshness, fun and endless struggle energy.

I hope it can help you solve the problem.