In the mid-20th century, we began launching satellites into space that would help us determine the exact circumference of the Earth: 40,030 km. But over 2000 years earlier, a man in Ancient Greece ...

Born around 276 B.C. in Cyrene, Libya, Eratosthenes soon became one of the most famous mathematicians of his time. He is best known for making the first recorded measurement of the Earth’s ...

Science teachers in a summer physics class at Southeast Missouri State University relied on shadows Thursday to calculate the Earth's circumference during the summer solstice, the longest day of the ...

More than 2,000 years ago, a Greek mathematician proved that the surface of the Earth was curved and not flat. That mathematician was Eratosthenes, who was a geographer, poet, astronomer, and music ...

Some days the world feels really big and some days it feels quite small, but as you might suspect, it doesn't actually change size. Here in the 21st century, we know the circumference, density, and ...

The U.S. Army has succeeded in shrinking the circumference of the earth by about half a mile. To make the new estimate, according to a paper submitted to the American Geophysical Union by Bernard ...

Do you know how to measure the diameter of the earth? No? Then you’re less advanced than they were in 230 BC. You’re basically a Neanderthal with access to a microwave. Find out how to fix that in ...

Introduction If you wanted to measure the circumference of Earth, how long would your tape measure have to be? Would you need to walk the whole way around the world to find the answer? Do you think ...

It's a question that has plagued the minds of human beings since the beginning of time: Is the Earth flat, or is it round? The answer has been floated around for centuries. The ancient Greek ...