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Eratosthenes observed that at noon during the summer solstice, the sun cast no shadow in Syene (modern Aswan, Egypt) while at the same time, shadows were cast in Alexandria. By measuring the angle of the shadow in Alexandria and knowing the distance between the two cities, he used basic geometry to calculate the circumference of the Earth. His observations of the sun's position and the varying shadows provided the foundation for estimating the Earth's size with remarkable accuracy for his time.
What else can I help you with?
Who believed the earth was a sphere?
Ancient scholars such as Pythagoras, Aristotle, and later on, Eratosthenes believed that the Earth was a sphere. They based their beliefs on observations of the Earth's shape and movements, as well as mathematical and geometric principles.
Which Greek scientist concluded the earth was around?
The Greek scientist who concluded that the Earth was round was Pythagoras, around the 6th century BC. His observations of the shape of the Earth influenced later scholars like Aristotle and Eratosthenes.
What describes how Eratosthenes discovered the approximate circumference of the earth?
Which of the following describes how Eratosthenes discovered the approximate circumference of the earth
Which greek scientist said te earth is round?
The Greek scientist who is credited with demonstrating that the Earth is round was Pythagoras. He believed that the Earth was a sphere based on observations of the shapes of celestial bodies like the moon during lunar eclipses.
Who found circumference of earth?
Eratosthenes
Who is calculate the circumference of earth?
Eratosthenes
Describe how eratosthenes measure the size of Earth?
Eratosthenes measured the size of Earth by using the Sun's angles, as well as a bit of geometry.
How did Eratosthenes measure the circumference of the earth?
HERE ARE SOME SITES YOU MIGHT WANT TO TAKE A LOOK AT... WITH A SHORT DESCRIPTION OF WHAT INFORMATION IT HAS ON THE WEBPAGE. * http://en.wikipedia.org/wiki/Eratosthenes- This is the Wikipedia page for Eratosthenes. It has a lot of information about him as well as how he measured the circumference of the Earth. It also lists reasons why Eratosthenes's calculation of the Earth's circumference has limited accuracy. * http://www.juliantrubin.com/bigten/eratosthenes.html - This site has all the information about how Eratosthenes measured the circumference of the Earth. It has a diagram to illustrate and explain further. This site also lists other sites and books relating to the math topic. * http://outreach.as.utexas.edu/marykay/assignments/eratos1.html - This is a webpage with information on how to do an activity related to Eratosthenes and his calculation of the Earth's circumference. It has some diagrams, some that show how Eratosthenes measured it, and some show real-world examples of how you can calculate the Earth's circumference just like Eratosthenes. Along with the drawing, this webpage has instructions on how you can measure the circumference of the Earth in real-life situations. * http://www.astro.cornell.edu/academics/courses/astro201/eratosthenes.htm - This webpage shows how the Earth's circumference was measured by Eratosthenes using geometry. It has a nice, easy-to-understand diagram to further explain Eratosthenes's calculation. The information on the webpage is probably very reliable since it's from a university. * http://mathforum.org/library/drmath/view/58988.html - This webpage is from Dr. Math's website. It has a very detailed explanation of how Eratosthenes measured the circumference of the Earth. There are no diagrams though. * http://eduwww.mikkeli.fi/opetus/myk/kv/comenius/erathostenes.htm - This webpage has a short summary of Eratosthenes's life. It has information on how the sieve of Eratosthenes, another thing Eratosthenes worked out in during his lifetime, worked. This page also has a lot of information about Eratosthenes and his calculation of the Earth's circumference, with a couple of drawings to make it easier to understand. * http://maps.unomaha.edu/Peterson/carta/Notes/eratosthenes.html - This website has a short biography of Eratosthenes and also how he measured the circumference of the Earth. The explanation is very detailed and easy to understand even without the support of diagrams. This site has a .edu in the address, so I think it will be very reliable. * http://www.pbs.org/wnet/hawking/cosmostar/html/cstars_eratho.html - This PBS webpage has a short summary of Eratosthenes's life. This webpage has a little bit of information of Eratosthenes measure of the circumference of the Earth. It also tells how other great mathematicians, like Posidonius and Ptolemy, tried to measure the circumference of the Earth.
What did Eratosthenes determine?
He postulated the circumference of the earth.
Who was the first to discover the earth's diameter?
Eratosthenes
When did Eratosthenes discover that the earth is not flat?
He did not do so. Earth was well-known to be a globe for at least two hundred years before Eratosthenes' time. What Eratosthenes did was to measure the earth's circumference for the first time. He did that at some time between 236 BC and 195 BC.
In 250 BC who determined the size of the earth?
Eratosthenes
