Over 2,000 years ago, Eratosthenes proved the Earth was round and measured it using only shadows and basic math. On the summer solstice, he noticed that while objects cast shadows in Alexandria, they didn’t in Syene. That tiny clue unlocked the secret of Earth’s size: 40,000 km, nearly perfect by modern standards. His work survived despite the tragic loss of the Library of Alexandria, while Ptolemy’s later miscalculations led Columbus astray. | History Revived
Over 2,000 years ago, Eratosthenes proved the Earth was round and m…
934 views4 weeks ago
FacebookHistory Revived
This incredibly accurate science experiment was centuries ahead of its time. | Business Insider
2:02
This incredibly accurate science experiment was centuries ahead o…
24.5M viewsOct 28, 2016
FacebookBusiness Insider
Who is Eratosthenes? Life, Biography & Discoveries of Eratosthenes
Who is Eratosthenes? Life, Biography & Discoveries of Eratos…
Mar 9, 2011
planetfacts.org
Eratosthenes - Alchetron, The Free Social Encyclopedia
Eratosthenes - Alchetron, The Free Social Encyclopedia
Jan 12, 2011
alchetron.com
Eratosthenes
Eratosthenes
Mar 3, 2022
worldhistory.org
Biography of Eratosthenes, Greek Mathematician and Geographer
Biography of Eratosthenes, Greek Mathematician and Geographer
Jul 3, 2019
thoughtco.com
Eratosthenes (276-195 BC)
Eratosthenes (276-195 BC)
Feb 5, 2014
weebly.com
Method of Eratosthenes I. You are an astronomer on planet Nearth, w…
Jul 31, 2021
numerade.com
Carl Sagan Explains How Eratosthenes Knew the Earth Wa…
Mar 2, 2017
twistedsifter.com
How an Ancient Greek Calculated the Earth's Circumference - Greek…
Jul 1, 2023
greekreporter.com
2:14
A wonderful clip of humanist and cosmologist, Carl Sagan, on the G…
41.3K viewsNov 9, 2022
FacebookHumanists UK
2:33
2.3K views · 60 reactions | Carl Sagan shows how Eratosthenes's …
2.3K views3 weeks ago
FacebookScientia
6:41
This measurement is more than 2,200 years old, and its accuracy i…
Sep 4, 2021
ABC Newsbusiness reporter Gareth Hutchens
Eratosthenes' Experiment: Fascinating Video Explains How H…
Oct 24, 2017
thinkinghumanity.com
0:58
How Eratosthenes Measured the Earth 2200 Years Ago with Just a …
3.4K views2 weeks ago
YouTubeVylort
0:45
He Measured Shadows And Proved The Earth’s Shape || #eratosthene…
694 views1 month ago
YouTubeHistory and Philosophy AI
3:59
Eratosthenes the man who measured the earth
358 views2 weeks ago
YouTubeExplanatius 4u
Knowledge on Instagram: "Ancient Greek scholar Eratosthenes calcul…
435.5K views1 month ago
Instagramcosmic.eduverse
7:29
Eratosthenes
70.1K viewsMar 9, 2012
YouTubeMITK12Videos
0:47
Exo Explorer on Instagram: " In 240 BC, the Greek mathematician …
7.1K views2 months ago
Instagramastrophysiccs_
2:15
GEOGRAPHY L3 Eratosthenes, first person to calculate the circumfere…
2.5K viewsMar 20, 2021
YouTubeApplied Approach
5:58
How the Greeks Knew that the Earth is Spherical?
1.1K viewsJun 21, 2023
YouTubeLearn New Things Today
0:34
Eratosthenes: The Man Who Measured the Earth
364 viewsJan 11, 2024
YouTubeD & D - Days and Dreams
Eratosthenes, a Greek mathematician and astronomer fro…
363 viewsAug 1, 2024
TikTokunderstanduniverse
1:02
How to Pronounce Eratosthenes? (CORRECTLY)
27.6K viewsMar 20, 2021
YouTubeJulien Miquel
1:36
Erastosthenes Erdumfang
30.1K viewsOct 12, 2015
YouTubeThe Wobbix
2:22
Ancient Greece - Geometric Astronomy
8K viewsDec 21, 2017
YouTubeΑncient Greece
6:42
Carl Sagan - Cosmos - Eratosthenes
2.7M viewsApr 24, 2009
YouTubecarlsagandotcom
4:52
The Sieve of Eratosthenes
42.6K viewsNov 9, 2014
YouTubeEddie Woo
6:54
NASA | Earthrise: The 45th Anniversary
2.2M viewsDec 20, 2013
YouTubeNASA Goddard
See more videos
Static thumbnail place holder