In geodesy and geophysics, theoretical gravity or normal gravity is an approximation of the true gravity on Earth's surface by means of a mathematical model representing (a physically smoothed) Earth. The most common model of a smoothed Earth is an Earth ellipsoid , or, more specifically, an Earth spheroid (i.e., an ellipsoid of revolution ).
In geodesy and geophysics, theoretical gravity or normal gravity is an approximation of the true gravity on Earth's surface by means of a mathematical model representing (a physically smoothed) Earth. The most common model of a smoothed Earth is a rotating Earth ellipsoid of revolution (i.e., a spheroid ).
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an Earth ellipsoid , or, more specifically, an Earth spheroid
a rotating Earth ellipsoid of revolution
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an ellipsoid of revolution
a spheroid