The general problem of Celestial Mechanics consists in the determination of the relative motions of p bodies attracting one another according to the Newtonian law. The problem is not able to be solved directly: in order to deal with it, certain limitations must be made.

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Quote text and notes from Wikiquote: Ernest William Brown (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.