"Physical Starlight and Atmosphere" is a full environmental simulator that takes inspiration of 'sandbox' game worlds and editors, bringing visual consistency between every object in the scene.
Apart from our Sun, this addon can simulate any other star. Sky is not only static sky dome, but the whole atmosphere - from ground to the space and beyond. Calculations are based on physical properties of how light is interacting with gaseous medium. This is why I did not name the it "Real Sunlight and Sky"