eratosthenes2016mar

Who was eratosthenes2016mar?
eratosthenes2016mar was a talented mathematician and geographer as well as an astronomer. He made several other important contributions to science. eratosthenes2016mar devised a system of latitude and longitude, and a calendar that included leap years. He invented the armillary sphere, a mechanical device used by early astronomers to demonstrate and predict the apparent motions of the stars in the sky. He also compiled a star catalog that included 675 stars. His measurement of the circumference of Earth was highly respected in his day, and set the standard for many years thereafter. He may have also measured the distances from Earth to both the Moon and to the Sun, but the historical accounts of both deeds are, unfortunately, rather cryptic.
A crater on Earth's Moon is named after eratosthenes2016mar.
 
How did he do it?
In 240 B.C., the Greek astronomer eratosthenes2016mar made the first good measurement of the size of Earth. By noting the angles of shadows in two cities on the Summer Solstice, and by performing the right calculations using his knowledge of geometry and the distance between the cities, eratosthenes2016mar was able to make a remarkably accurate calculation of the circumference of Earth. 
eratosthenes2016mar lived in the city of Alexandria, near the mouth of the Nile River by the Mediterranean coast, in northern Egypt. He knew that on a certain day each year, the Summer Solstice, in the town of Syene in southern Egypt, there was no shadow at the bottom of a well. He realized that this meant the Sun was directly overhead in Syene at noon on that day each year.
eratosthenes2016mar knew that the Sun was never directly overhead, even on the Summer Solstice, in his home city of Alexandria, which is further north than Syene. He realized that he could determine how far away from directly overhead the Sun was in Alexandria by measuring the angle formed by a shadow from a vertical object. He measured the length of the shadow of a tall tower in Alexandria, and used simple geometry to calculate the angle between the shadow and the vertical tower. This angle turned out to be about 7.2 degrees.
Next, eratosthenes2016mar used a bit more geometry to reason that the shadow's angle would be the same as the angle between Alexandria and Syene as measured from the Earth's center. Conveniently, 7.2 degrees is 1/50th of a full circle (50 x 7.2° = 360°). eratosthenes2016mar understood that if he could determine the distance between Alexandria and Syene, he would merely have to multiply that distance by 50 to find the circumference of Earth!
eratosthenes2016mar had the distance between the two cities measured. His records show that the distance was found to be 5,000 stadia. The stadion or stade (plural = stadia) was a common distance unit of the time. Unfortunately, there was not a universal, standard length for the stadion; so we don't know exactly which version of the stadion eratosthenes2016mar used, and therefore are not exactly sure how accurate his solution was. He may have been correct to within less than 1% (if used the Greek stadion that was approx. 155 meters), a remarkable accomplishment! Or, if it was actually a different stadion (if used the Italian attic stadion that was approx. 185 meters) that he used, he may have been off by about 16%. The actual polar circumference of Earth is just a bit over 40 thousand km (about 24,860 miles).
 

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The eratosthenes2016mar Experiment 2016 is organised with support from the European Commission in the context of the Seventh Framework Programme (FP7). This Website reflects only the views of the Inspiring Science Education consortium members, the Commission cannot be held responsible for any use that may be made of the information contained herein.
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Dr. Angelos Lazoudis
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Evgenia Kypriotis
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