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Published online by Cambridge University Press: 30 September 2008
The theory of location systems involves the geometric and physicaldescription of the protocols allowing the realization of coordinatesystems. In this communication, the incidence of the space-timecausal structure (Newtonian or relativistic) on the construction oflocation systems is remarked. Specifically, we focus our attention:(i) on the construction of Newtonian emission coordinates that arecontrasted with those associated with relativistic positioningsystems, and (ii) on the role played by non-absolutesynchronizations (like the one provided by the local Solar time) inthe comprehension of Newtonian and relativistic location systems.