If the Earth really was a sphere, Eratosthenes could use his observations to estimate the circumference of the entire planet. Since the difference in shadow length is 7 degrees in Alexandria and ...

Habes has an article which describes the method adopted by Eratosthenes for measuring the circumference of the earth. He knew that the sun threw no shadow at the summer solstice at Syene (the ...

By assuming that the sun was sufficiently far away so as to cast parallel rays at Syene and Alexandria, Eratosthenes realised that he could determine the circumference of Earth by finding out the ...

If the Earth really was a sphere, Eratosthenes could use his observations to estimate the circumference of the entire planet. Since the difference in shadow length is 7 degrees in Alexandria and ...

Born in the ancient city of Libya, Eratosthenes of Cyrene (276 BC-194 BC) was able to calculate the diameter and circumference of the Earth without the help of high-tech tools. He was a ...

Living around 250 BCE, Eratosthenes was the first to develop an accurate method for measuring the circumference of the Earth. And like all great theorists before and since, he didn’t even need ...

more than one-quarter of the earth’s circumference. Part of the arc coincided with the arc that Eratosthenes used. Data for measuring the Finland-South Africa arc came from many sources.