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There is a vertical and a horizontal component of the centrifugal force. The horizontal component points into the

negative y direction. However, this force is not explicitly present in the vector momentum equation (that we assemble right now in the lectures). The Earth's shape has adapted to this horizontal component of the centrifugal force and is therefore characterized by a slight oval shape instead of a perfect spherical shape. Take a look at the sketch below:

Figure_1.png

Figure_1.png

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