  It is shown that for Robertson-Walker models with flat or closed space
sections, all of the cosmological spectral shift can be attributed to the
non-flat connection (and thus indirectly to space-time curvature). For
Robertson-Walker models with hyperbolic space sections, it is shown that
cosmological spectral shifts uniquely split up into "kinematic" and
"gravitational" parts provided that distances are small. For large distances no
such unique split-up exists in general. A number of common, but incorrect
assertions in the literature regarding interpretations of cosmological spectral
shifts, is pointed out.
