Mars Surface Curvature: 2m/3600m

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SUMMARY

The curvature of Mars results in a vertical drop of 2 meters for every 3600 meters of horizontal distance. This means that if a straight edge were placed along the surface of Mars, it would rise 2 meters above the surface after traveling 3600 meters. This curvature implies that a person who is 2 meters tall would only see the horizon at a distance of 3600 meters. Diagrams A and B illustrate this concept effectively.

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What does it mean by the sentence:

The curvature of Mars is such that its surface drops a vertical distance of 2 meters for every 3600 meters tangent to the surface.
 
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A tangent to a circle is a straight line that just about touches the edge of the circle somewhere (anywhere). So imagine a huge straight edge resting on Mars' surface. If you were to follow that straight edge from the point it touches Mars for 3600 meters, you would find that the straight edge is now 2 meters above the surface of Mars, such is the curvature of Mars.
 
See diagram A for a literal translation of the sentence.
See diagram B for its significance.

It means that, to a 2m tall person, Mars' horizon is a mere 3600m away.
 
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