This paper presents a unified interpretation of cosmic structure based exclusively on classical gravitation, General Relativity, and observational astrophysics, in which the so-called dark sector is entirely reinterpreted as real baryonic matter. The central point is the introduction of two formal concepts, Baryonic Obscurus and Cosmos Tenebris, and a simple, dynamic mathematical formalism that reclassifies all inferred gravitational mass as the sum of visible and obscured baryonic components. The work reviews the historical foundation from Aristotle and Ptolemy to Newton and Einstein, outlines early-universe vector dynamics, and analyzes large-scale gravitational flows such as Laniakea, the Great Attractor, and Shapley. The conclusion is that the observational evidence supports a purely baryonic interpretation of cosmic mass, eliminating the need for hypothetical dark matter and dark energy.