Psalm 136:8&9

[To him who made]⁸ the sun to govern the day,
            His love endures forever.
⁹ the moon and stars to govern the night;
            His love endures forever.
--Psalm 136:8&9

The light rules over the darkness wheter it surrounds (day) or is surrounded by darkness (night); it is the light that governs and dominates because His love endures forever.