地平线是人们看到地球表面时能够看到的最远处的那条线。它的位置常常被误认为是地球的结构和形状的不同表现。但实际上，地平线是由我们的视线距离所限制的结果。
地球是一个球形的天体，但我们站在地球表面上时，我们只能看到我们周围的一小部分。当我们的视线越过地球表面时，地球的曲率会遮挡我们看远处的视野。由于地球曲率的限制，我们只能看到离我们越远的物体的部分。
地平线的位置取决于我们的视线高度。当我们站在平坦区域时，地平线可以看到很远。然而，如果我们站在高处，例如山顶或大楼的顶部，我们的视线高度会增加，因此我们可以看到更远的地平线。
总之，地平线是由于我们的视线距离所限制的结果，它的位置取决于我们的视线高度和地球表面的曲率。地平线的位置不会因为地球的结构和形状的不同而改变。
关键词：地平线、视线、地球曲率、视线高度、位置
What is the horizon and how is it formed?
The horizon is the furthest line we can see on the Earth's surface. Its position is often mistaken as a representation of the Earth's structure and shape. However, the horizon is actually a result of the limit of our vision.
The Earth is a spherical celestial body, but when we stand on its surface, we can only see a small part of our surroundings. When our line of sight passes over the Earth's surface, the curvature of the Earth blocks our view of the distant horizon. Due to the curvature of the Earth, we can only see a part of distant objects.
The position of the horizon depends on our line of sight height. When we stand on a flat surface, the horizon can be seen for a long distance. However, if we stand at a high point such as the top of a mountain or a building, our line of sight height will increase, and we can see further.
In conclusion, the horizon is a result of the limit of our vision, and its position depends on our line of sight height and the curvature of the Earth's surface. The position of the horizon does not change due to the differences in the Earth's structure and shape.
Keywords: horizon, line of sight, curvature of the Earth, line of sight height, position.