We set up a very simple scene consisting of three images stacked up to form a landscape. Between the background layer (the sky) and the foreground (trees), we placed a yellow circle representing the sun. Since we will be moving the sun around in a moment, we anchored the center of the object to an empty item without physical dimensions so that we can set the sun's position relative to its center. We also equipped the scene with a dayLength property, which will hold information about the length of one day of game time. By default, we set it to 60 seconds so that things happen really quickly and we can see the animation's progress without waiting. After all things are set correctly, the length of the day can be balanced ...
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