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The point where the diagonals meet.
you can find center of earth by using only the formulas
It is the one point that does not move during rotation.
In mathematics, the angle of rotation is a measurement of the amount, the angle, that afigure is rotated about a fixed point, often the center of a circle.For example, the carts on a Ferris wheel move along a circle around the center point of that circle. If a cart moves around the wheel once, the angle of rotation is 360 degrees. If the cart was stuck halfway, at the top of the wheel, at that point its angle of rotation was only 180 degrees.
A circle is the set of all the points that have the same distance from a given point (its center). If you rotate a shape, you rotate it in such a way that you keep any point a fixed distance from the center of rotation.