# Distance across the surface vs distance through the Earth

This calculator calculates distance across the surface of the Earth and distance through the Earth for given two points, then compares them.

After implementing the Distance through the Earth calculator, I have thought that it makes more sense and more fun to view distance across the Earth's surface and distance through the Earth side-by-side and be able to compare them. So, the calculator below combines the outputs of Distance through the Earth and Distance calculator calculators and compares them. I used New York and San Francisco coordinates as default coordinates. Theory and formulas can be found at the abovementioned links.

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