The General Theory of Relativity (GR) and the Dynamic Universe (DU) are evaluated in how they explain frequencies of atomic clocks. DU and GR predict the frequencies with equal accuracy, but their explanations, the postulates they apply in the explanations and the word-views that come along with them are entirely different. The central argument is that if unified and understandable physics is appreciated, then DU deserves to be taken as a viable alternative to GR. In GR different frequencies of identical atomic clocks are explained by letting rates of the flow of time in their frames of reference vary as functions of the clocks' states of motion and gravitation. The GR-based world-view is nonunderstandable because GR violates absolute simultaneity, and disunified because quantum mechanics... is built on different postulates than GR. In DU different frequencies of identical atomic clocks are explained by letting their frequencies vary as functions of their states of motion and gravitation. As DU commits to absolute simultaneity and as the postulates of DU suffice as the ontological ground of quantum mechanics at least partially, DU provides an understandable and unified scientific world-view.