This article represents the culmination of a decade-long effort to develop the World-Universe Cosmology (WUC), building upon a series of published works. These include the first one, "5D World-Universe Model. Space-Time-Energy" [1] and the last one, "JWST Discoveries and the Hypersphere World-Universe Model. Transformative New Cosmology" [2], both featured in the Journal of High Energy Physics, Gravitation and Cosmology. WUC is a unified model of the World built around the concept of the Cosmic Medium, composed of particles (protons, electrons, photons, neutrinos, and universe-created particles). WUC provides a mathematical framework that enables precise calculation of Medium-bound physical parameters: Gravitational parameter, Hubble’s parameter, Absolute age of the World, Intergalactic plasma parameters, Temperature of microwave background radiation and the Minimum energy of photons. This paper aligns WUC with the theoretical framework developed by P. Wesson and J. Overduin [3], [4], albeit assigning a new physical meaning to the fourth spatial coordinate associated with the total energy of the observable World.