how the radius of the earth is caluculated?

Question

about radius of the earth.

Answer 1

First, you take a REALLY BIG tape measure and measure around the whole earth at the equator. That gives you the circumference of the two dimensional circle defined by the equator. Divide that number by pi. Then divide the resulting quotient by 2. Now you have the radius.

If you don't have a tape measure that big, and your mom won't give you the recipe for pi, you can try a different method. Check out this method to get the circumference: http://staff.imsa.edu/science/astro/astrometry/ground1.html

The Greek had of the library of Alexandria did it more than two thousand years ago. All you have to do it get to Egypt at noon on the 21st of June for two years in a row. And you have to find two wells.

Once you have the curcumference, you can use my recipe for pi. (3.160484) Once again, divide the circumference of the earth by pi, and then by 2.

Hope this helps.

Answer 2

it can be caluclated by global earth postioning.