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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 ...

Circumference of Earth | Measuring the solar system | Khan Academy

www.khanacademy.org/partner-content/nasa/measuringuniverse/measure-the-solarsystem/v/eratosthenes_measures_earth

... please enable JavaScript in your browser. Measuring the Universe. Measuring the solar system. A flat earth · Arc length · Circumference of Earth · Occultations.

How Big is Earth? - Space.com

www.space.com/17638-how-big-is-earth.html

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

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/

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 your c.

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 Cosmic Distance Scale - Imagine the Universe! - NASA

imagine.gsfc.nasa.gov/features/cosmic/earth_info.html

Aug 24, 2015 ... The diameter of the Earth at the equator is 12,756 kilometers (km). ... between Syene and Alexandria to the total circumference of the Earth.

www.ask.com/youtube?q=What Is The Circumference Of Earth?&v=Cce1XJ3BCxg
Dec 8, 2014 ... "The Deepest Place On Earth" Amazing Full Documentary 2015 - Duration: ... Sagan on Eratosthenes' calculation of Earth's Circumference ...
Answer
The equatorial circumference of Earth is 40,075 kilometers (24,901 miles).
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How the Circumference of Earth Was Accurately Estimated 2000 ...

gizmodo.com

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 ...

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 ...

Essential Facts You Need to Know About The Planet Earth

geography.about.com

Here you will find a listing of essential facts about planet Earth, the home to all of humanity: The circumference of the Earth at the equator is 24,901.55 miles ...