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This paper proposes a novel theoretical model to explore the geometry of a closed universe, treating it as the crust of a four-dimensional sphere. Building upon the FLRW model and considering alternative cosmological scenarios, the study examines the motion of light in the fourth dimension to infer the universe's curvature. The approach involves mathematical modeling of spiral light trajectories, a theoretical framework for the nature of time across quantum and cosmic scales, and the determination of the universe's four-dimensional radius using Hubble's law. The model predicts the existence of mirror points and provides calculations of their positions relative to Earth under various parameters. This work aims to refine our understanding of the universe's structure and its implications for cosmology.