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## Eratosthenes

en.wikipedia.org/wiki/Eratosthenes

Eratosthenes of Cyrene was a Greek mathematician, geographer, poet, astronomer, and music .... Eratosthenes calculated the circumference of the Earth without leaving Egypt. He knew that at local noo...

## The Man Who Accurately Estimated the Circumference of the Earth ...

www.todayifoundout.com/index.php/2014/01/amazing-eratosthenes/

Jan 1, 2014 ... Today I found out about a man who fairly accurately estimated the circumference of the Earth well over 2,000 years ago: Eratosthenes of ...

## How the Circumference of Earth Was Accurately Estimated 2000 ...

gizmodo.com/how-the-circumference-of-earth-was-accurately-estimated-1493009177

Jan 2, 2014 ... He is best known for making the first recorded measurement of the Earth's circumference, which was also remarkably accurate. (And, yes ...

## What is the circumference of the earth? - Geography - About.com

But, if you measure the earth through the poles the circumference is a bit shorter - 24,859.82 miles (40,008 km). This the earth is a tad wider than it is tall, giving it ...

## How to Determine the Earth's Circumference - For Dummies

www.dummies.com/how-to/content/how-to-determine-the-earths-circumference.html

You can figure out the earth's circumference using a geometric formula that's over 2,000 years old! Contrary to popular belief, Christopher Columbus did not ...

## Calculating the Circumference of the Earth - Science Buddies

www.sciencebuddies.org/science-fair-projects/project_ideas/Astro_p018.shtml

How big a ruler would you need to measure the circumference of the Earth? Did you know that you can do it with a yardstick? (And you won't have to travel all ...

## Circumference of the Earth - Universe Today

www.universetoday.com/26461/circumference-of-the-earth/

Mar 2, 2009 ... The circumference of the Earth in kilometers is 40075 km, and the circumference of the Earth in miles is 24901. In other words, if you could drive ...

## Measuring the circumference of the world - Io9

io9.com/5587641/measuring-the-circumference-of-the-world

Jul 21, 2010 ... 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 ...

Dec 8, 2014 ... Scientists with years of experience agree on the earth being round. ... +Benjamin Li And even then you have to consider that the Earth isn't a ...

## Eratosthenes' Calculation of Earth's Circumference

www.windows2universe.org/citizen_science/myw/w2u_eratosthenes_calc_earth_size.html

Jul 20, 2007 ... In Alexandria, a tower cast a shadow on the Summer Solstice. The Sun was NOT directly overhead there. Eratosthenes knew the distance ...

The equatorial circumference of Earth is 40,075 kilometers (24,901 miles).

### Circumference of Earth | Measuring the solar system | Khan Academy

Circumference of Earth. About. Created by NASA. ShareTweetEmail. Measuring the solar system. A flat earth · Arc length · Circumference of Earth · Occultations.

### Fermi's Earth Circumference

rainbow.ldeo.columbia.edu

The Nobel-prize-winning physicist, Enrico Fermi, came up with this simple and intuitive way to deduce the circumference of the earth. 1. How many time zones ...

### How Big is Earth? - Space.com

www.space.com

Sep 17, 2012 ... Earth is the fifth largest planet in the solar system and the densest. Diameter of Earth, circumference, mass & volume explained.