Before cell phones and watches and clocks, humans experienced time by looking up. We watched the movements of the sun, we tracked the motion and phases of the moon, and we studied the stars. Today, as we continue to lose our view of the celestial clock, our connection to the natural rhythm of our lives and our link to the distant past is diminished. Protecting night skies and reducing light pollution can help us maintain, restore, and better understand our ongoing inevitable relationship with time.