As Moller's text on Relativity makes clear, the centrifugal, Coriolis and Eulerian forces which are treated as fictitious forces in a non-geocentric context are real, actual forces in a geocentric context. Further, the origin of inertia must be understood properly prior to mounting an analysis. (This is important because one would otherwise misunderstand a helpful analogy: comparing eg Voyager to a marble rolling linearly from the center of a spinning merry-go-round to the outer rim. The analogy might lead one to expect centrifugal force to hurl the marble (Voyager) off the merry-go-round -- but in the case of the actual rotating cosmos, the inertial field is FIXED to the aggregate universal mass, while a playground's merry-go-round is ROTATING with respect to that inertial field. Therefore, the Voyager participates in the rotation of the cosmic mass around the earth, but the inertial effects must be scaled to its relative motion "with respect to the distant stars" (often called the "fixed stars" under the influence of Copernican thinking).