# Prove earth is round

1. Aug 13, 2008

### chewy11577

1. The problem statement, all variables and given/known data
Can you prove the earth is round by mathematical equation?

2. Relevant equations

3. The attempt at a solution

2. Aug 13, 2008

### cristo

Staff Emeritus
Is this really a homework question? If so, you should fill in sections 2 and 3 of the homework posting template.

3. Aug 13, 2008

### Dick

Obviously not. The earth being flat is not inconsistent with mathematics. You have to make a physical observation.

4. Aug 14, 2008

### Feldoh

Define "round" it's sort of ambiguous

5. Aug 14, 2008

### Defennder

Spherical?

6. Aug 14, 2008

### Gear300

The Earth is actually closer to an oblate spheroid (if I have it right)...yes, this can be shown mathematically.

7. Aug 14, 2008

### stewartcs

Probably not since the earth is not round.

It has a buldge at the equator...too many donuts.

CS

8. Aug 14, 2008

### black_squirrel

yea use the formula for the surface area of a sphere 4pi*r2. Then compare it to the actual surface area of the earth. you will see that the numbers do not match proving earth is flat :D

9. Aug 14, 2008

### Alex6200

Put simply one could observe that it is possible to circumnavigate the globe, or leave the Earth in a spaceship without seeing the edge. It's not difficult.

And yes, you can't prove that the Earth is round through mathematics, you have to show an observation.