May the 4th

If Tattoine was a planet in a dual star system, it's highly unlikely that both stars would be the same size. A dual star system generally has one smaller star in orbit around a larger one. Of course, there might be brief periods where the orbits would present a similar size because of their relative distance from the observer. But this scene has always looked like it was the same sunset of one star superimposed over itself several minutes later.

Still, it's a great visual effect! May the Fourth be with you, lapucelle!