Distance across the surface vs distance through the Earth

After implementing the Distance through the Earth calculator, I have a thought that it makes more sense, and more fun to view distance across the surface of the Earth 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.

Distance across the surface vs distance through the Earth

First point latitude

°

′

″

N

S

First point longitude

°

′

″

E

W

Second point latitude

°

′

″

N

S

Second point longitude

°

′

″

E

W

Calculation precision

Digits after the decimal point: 3

Calculate

Distance across the surface, km

 

Distance through the Earth

 

Difference, km

 

Difference, %

 

PLANETCALC, Distance across the surface vs distance through the Earth