ancient hypothesis about the shape of the Earth

about what exactly the Earth forms, throughout the history of the natural sciences have argued many scientists and researchers.For example, Homer makes the assumption that the earth is a circle.At the time, Anaximander proceeded from the fact that our planet is more like a cylinder.In ancient times, people also assume that the earth is a disc, which is held on a turtle, which, in turn, rests on three elephants, and so on.There were some suggestions that the planet is in the shape of a boat floating on the boundless ocean of the universe, and rises above it in the form of mountains.

In ancient times, it was thought that the sky is a huge dome.It covers the entire Earth, it fixed stars and the sun and moon ride around on
it in chariots.While there was a legend that a stranger who came to the edge of the world, above all convinced of their own eyes.These primitive notions about the universe the earth ceased to satisfy scientists and philosophers of ancient Greece more than two thousand years ago.In the sixth century BC, Pythagoras already knew that the earth is a sphere and nothing is not held.Aristotle summed up the development on the subject of philosophers and mathematicians of the time.He took the view that the Earth is a natural center of the whole universe.This recognition of the sphericity of the planet was a significant step forward for the science of the time, although remaining arguments have been very controversial.The geocentric system was accepted by most scientists until the sixteenth century.

However, in the late nineteenth century it was generally accepted that our planet is in a completely stationary.Later, the official science has recognized the fact that not the Earth and the Sun moving around our planet.Indeed conjecture to this effect was put forward only encyclopedic Nicolaus Copernicus.

Modern scientific research forms the Earth

most of all close to the true shape of the Earth Bessel.German scientists have managed to calculate the radius of the compression of the planet at the poles.These data were obtained in the nineteenth century and were considered unchanged for almost a century.The figures, more of these, only got in the 20th century Soviet scientist FN KrasovskySince that time, the exact dimensions of the ellipsoid bear his name.Difference between the equatorial and polar radii of 21 kilometer.These are unchanged from 1963