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Sky atmosphere day/night cycle problem.

Hi, i have a project where Im using sky atmosphere for simulate the lighting in a tropical beach, i want record a video in sequencer where the sun sets and a moon rises making the stars appear.
I watch this video: Exploring the depths of the new Sky & Atmosphere system | Unreal Engine - YouTube, here it is shown that it is possible to add the stars when the sun sets but I don’t understand how the material is created on purpose and how it is used to mask.
does anyone know how I can investigate the matter? or if there is another way?