Lorentzian frames may belong to one of the 199 causal classes. Of these
numerous causal classes, people are essentially aware only of two of them.
Nevertheless, other causal classes are present in some well-known solutions, or
present a strong interest in the physical construction of coordinate systems.
Here we show the unusual causal classes to which belong so familiar coordinate
systems as those of Lema{\^{\i}}tre, those of Eddington-Finkelstein, or those
of Bondi-Sachs. Also the causal classes associated to the Coll light
coordinates (four congruences of real geodetic null lines) and to the Coll
positioning systems (light signals broadcasted by four clocks) are analyzed.
The role that these results play in the comprehension and classification of
relativistic coordinate systems is emphasized.Comment: 5 pages, 1 figure, short communication in A Century of Relativity
Physics, Proceedings of the XXVIII Spanish Relativity Meeting ERE-2006, 6-10
September - Oviedo - Spain (AIP Conference Proceedings
