I am the shade on a circle that's spinning. Two of us race, but neither is winning. Round you go, though I'm very still; you like to pretend that I rush at your will. But I'm the measure of what's not light, and it's hard to see while I'm in sight. Some feel afraid, and they huddle for morn. Others revel under stars being born. A side of a side, a yin of a yang; the space in which you see the bang. Hence the divide, for it lights the stage. The action below depends on your age. A lizard king sang of this play, telling them all _____ divides day.
What word am I looking for? (fill in the blank)
I gave you a clue!
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