What does an Erastrosthenes' do?

Answer 1

Eratosthenes was an ancient Greek mathematician and astronomer known for calculating the Earth's circumference with remarkable accuracy. He accomplished this by measuring the angles of shadows in different locations during the summer solstice. His method relied on simple geometry and the assumption that the Earth is spherical, making him one of the first to quantify the size of our planet. Additionally, he is credited with developing the concept of latitude and longitude and creating one of the earliest maps of the known world.