2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/3717In this paper we present the fundamentals of the cosmological special relativity (CSR) by discussing the dynamical concepts of velocity, acceleration and cosmic distances in spacevelocity. These concepts occur in CSR just as those of mass, linear momentum and energy appear in Einstein's special relativity (ESR) in spacetime.9 pages LaTeX, to be publishedAstrophysicstext