ologysoli.blogg.se - Gravity acceleration

#GRAVITY ACCELERATION HOW TO#

In addition to this broad-scale variation, local variations of a few parts in 10 6 or smaller are caused by variations in the density of Earth’s crust as well as height above sea level. The acceleration g varies by about 1/ 2 of 1 percent with position on Earth’s surface, from about 9.78 metres per second per second at the Equator to approximately 9.83 metres per second per second at the poles. Surface measurements of gravity are best for local geophysics, which deals with the structure of mountains and oceans and the search for minerals. For geodesy and global geophysics, it is best to measure the potential from the orbits of artificial satellites. Measurements of gravity and the potential are thus essential both to geodesy, which is the study of the shape of Earth, and to geophysics, the study of its internal structure. In turn, as seen above, the distribution of matter determines the shape of the surface on which the potential is constant. The value of the attraction of gravity or of the potential is determined by the distribution of matter within Earth or some other celestial body.

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#GRAVITY ACCELERATION HOW TO#

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On the other hand, concerning the last reason, I think but I am not sure, the uncertainty of the mass of the Earth could be reduced if it were calculated with the orbital period of a geostationary satellite as explained by evan_au (instead of the weight of a mass on the surface of the Earth) and then in the formula we would no longer have the value of g which varies everywhere on the surface of the Earth, in the formula, there would remain only the uncertainty of the value of G.

If I understood correctly, the difference between my values and those I have seen regularly on the internet is explained because the GM/r² formula works for a spherical symmetric mass and does not work for a planet which is oblate like the Earth and also because the value of M does not represent the real value of the mass of the Earth because it is calculated from the value of g which varies at different places on the surface of the Earth.