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The most common use of this science is the determination of the position of a given point on the surface of the planet

. Thus are determined the longitude, altitude and latitude of a specific geographic. Geodesy is also used to study the movement of these points. Over the centuries, geodesy has continued to evolve and develop to give rise to ever more complicated formulas, but still more accurate. In any case, this science has yielded valuable information and very constructive on the specifics of the planet Earth. If we look at the origin of geodesy, we must return for a long time back at a time when many believed that the earth was flat. It was not until scholars such as Pythagoras and his disciple Thales to prove and demonstrate conclusively that the earth actually has a spherical shape. This theory was brought to the world to the sixth century BC. At that time, it was accepted that the earth was round, but the theory that the earth turns on itself and makes around the sun was not yet on the agenda.

This may also be in the sixteenth century, when Copernicus brought evidence that revolutionized geodesy. In addition to these crucial discoveries, it is also worth mentioning Erathostne of Cyrene who lived in the third BC. This was the first scientist to develop a geometric formula to achieve an order geodetic calculations. The method has been developed by himself later served as the basis for other scientists who made a few changes.

Over the centuries, the calculation was inevitably refined geodesic to obtain data that approximate more and more reality. If, initially, was interested mainly in geodesy actual dimensions of the Earth, it is now used in many areas. This science is involved in the world of industry, mining, civil engineering or in the field of cadastre. In short, it is an indispensable tool in the calculations that use GIS or geographic information systems. The bases of north face jackets geodesy rely heavily on the characteristics of the blue planet. The calculations are based on the geodetic geoid is an area with anywhere the same value in terms of the potential gravity.

Specifically, if we observe the Earth from space, we would not see, contrary to what one might be tempted to believe, a perfect ball. The Earth is indeed present as a sphere whose poles are somewhat flattened. This configuration is not a coincidence: it is actually the form that would be a fluid that rotates around a fixed axis. And because the densities are not always north face jackets for women the same even within the earth's crust, the geoid which has been discussed above does not present itself as a perfect flattened ball. To this extent, specific mathematical models have been developed taking into account the specificities of the geoid. Thus, north face womens outerwear to provide perfect positioning of the Earth and provide more realistic measures, it is represented in space, not simply as a flattened ball, but as an integral part of the ellipsoids. Based on this observation, geodetic studies are based on one side of a reference ellipsoid and the other side of a marker in three dimensions. It alongitude and latitude are both taken into account. Finally, we obtain a so-called ellipsoidal height found by finding the difference lies between the reference ellipsoid and the point of which is to determine positioning. It also gets the value of altitude is the difference lies between the geoid and the point mentioned above.

by: Adair

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