How Eratosthenes calculated the Earth's circumference - YouTube
Eratosthenes | Biography, Discoveries, Sieve, & Facts | Britannica
Eratosthenes' Calculation of the Earth's Circumference (Illustration) - World History Encyclopedia
Circumference of the Earth - Universe Today
Eratosthenes - Measuring the Circumference of Earth - YouTube
Eratosthenes - Measuring the Circumference of the Earth in 240 BC
Eratosthenes: The Measurement of the Earth's Circumference
Measuring Diameters and Distances | Earth | Space FM
Earth's circumference - Wikipedia
The History of Geodes: Global Positioning Tutorial
Circumference of Earth - What is the circumference of the Earth, Calculation of Earth's circumference, Solved Examples.
Earth's Circumference, Eratosthenes, Astronomy, Solstices, Equinoxes, Latitude, Science, and Math Activity
How did the Greeks Measure the Earth's Circumference? | Ancient Origins
Eratosthenes Measurement of the Radius and Circumference of the Earth - Projeda
Determining the earth's size
How Eratosthenes Calculated the Circumference of The Earth | by Wojciech Wieczorek | Cantor's Paradise
Determining the earth's size
Measuring Shadows to Calculate the Size of Earth | NSTA
How to Determine the Earth's Circumference - dummies
How Eratosthenes Calculated the Earth's Circumference
eratosthenes.gif
This measurement is more than 2,200 years old, and its accuracy is remarkable - ABC News
Angles & Arc Length: Discovering Earth's Circumference (cont.)
Eratosthenes' measurement of Earth's circumference – GeoGebra
Calculating the Earth's Circumference at Any Date from Any Location - Wolfram Demonstrations Project
