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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 noon on the summer solstice in Syene ...

en.wikipedia.org/wiki/Earth

Earth is the third planet from the Sun and the only object in the Universe known to harbor life. ... Circumference. 40075.017 km equatorial (24901.461 mi) ...

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

If he carried out the calculation with the Greek stade, he would have miscalculate the circumference of the Earth by about 16%. However, he would have been ...

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 ...

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

Sep 15, 2017 ... Earth is the fifth largest planet in the solar system and the densest. Diameter of Earth, circumference, mass & volume explained.

www.thoughtco.com/essential-facts-about-the-planet-earth-1435092

Apr 24, 2017 ... 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: ...

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

Mar 2, 2009 ... The circumference of the Earth in kilometers is 40,075 km, and the circumference of the Earth in miles is 24,901. In other words, if you could ...

www.dummies.com/education/math/geometry/how-to-determine-the-earths-circumference

By Mark Ryan. You can figure out the earth's circumference using a geometric formula that's over 2,000 years old! Contrary to popular belief, Christopher ...

www.lyberty.com/encyc/articles/earth.html

What is the circumference of the Earth? How far around is the Earth? The average radius of the Earth is 3,959 miles (6,374 kilometers). The equitorial diameter of ...