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In the classic form of a sphere, followed investigations being described as "geoid", a name which has the advantage of not being controversial, because etymologically significant quick explanation "with a circle on the Earth." This form recognizes a flattening at the poles and line broadening Ecuador. Frenchify scientific equipment checked these details between 1735 and 1744, using mathematical methods found a greater curvature in Peru than in Lapland (Northern Europe). Only in 1961
information from the U.S. Vanguard satellite, which orbited the Earth for months, led to correct the shape of our world, indicating that the irregularities so closely resemble a pear, with its smaller radius from the center of the planet and the polar South. However, these irregularities are not seen even in the comments or the photos from space.


has been able to determine the diameter of Earth in Ecuador (12,756 km) and pole (42 km less.) These figures are consistent with those of the sailors of the seventeenth century as a equatorial circumference of nearly 40.000km.
If the understanding of the format has been working outside scientists, the recognition of its internal structure is still unfinished task insurmountable difficulties for direct verification. However, it has ascertained the existence of a well characterized series of layers.