Sunday Times News: The dimensions of the Earth was first measured by Greek philosopher Eratosthnes in 200 B.C. by using simple geometric methods. He dug a narrow well at ...

You might think the modern way to measure the radius of the Earth is to just look it up. Not so fast. Really, the fun isn't in knowing the answer; the fun is in getting the answer.

R is the radius of the Earth. Let me make one assumption -- that the arc length in the diagram (like s 1 ) is essentially the same length as the straight-line distance ( x 1 ).

Astronomers may be ready to explain our universe's lack of exoplanets twice the radius of Earth. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...

IN a paper entitled "The Story of Newton's Inverse Square Law and his Use of a False Radius of the Earth" (J. Brit. Astro. Assoc., 50, 2; 1939), John Miller states that the story of Newton's ...