I have implemented sun movement in a similar way to the “Survival Game”, using a movable directional light. However I find that updating the light direction at tick speed results in annoying rapidly flickering shadows. I have sort of cured this by reducing the updates to 2Hz frequency. However I’m wondering if you have a way to merge between less frequently updated shadow patterns, so as to get a smooth evolution of the shadows without flickering.
Thinking this could maybe be done using 2 directional lights with lerped intensities, though having 2 might cause some grief to the sky sphere.