# An observer From Mt. Everest Sees horizon 339 km Away, But Why He/She Does Not See Earth’s Curvature?

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Curvature is a few coherent concepts. In a general sense, this is the amount by which a curve deviates from a straight line or a surface deviates from a plane.

It is possible to calculate the magnitude of the curvature after knowing the average radius of the Earth (6371 km), trigonometric formulas, the Pythagorean theorem and correctly apply them, depending on the calculation method.

So, the magnitude of the earth’s curvature over a distance of one kilometer will be approximately 7.848 cm.

Let’s consider a little more in detail. To simplify, we believe that the terrain is perfectly flat. The observer looks from point A to the base of a tall object located, for example, 5 km from it.

In the first kilometer, the observation line will be below the eye level by 7.848 cm. In the second kilometer, the line is located at 31.392 cm below the level of the eyes that are at zero. In the fifth kilometer, as many as 1.96 meters of Earth’s curvature will obscure the base of the object.

The absolute height of the Mount Everest is 8848 meters. Given the curvature of our planet, from this peak, you can see the horizon at a distance of about 339 kilometers.

In clear weather, it is easy to observe an area of almost 3,60,000 sq.km. For comparison, countries such as Congo, Malaysia, Finland, Norway, Vietnam, Poland, Cote d’Ivoire occupy a little less.