But as Joan had taken each small step forward, the world had kept spinning on its axis. Days had formed into weeks and months and years, which people marked with watches and calendars, all based on the only thing they had to tell what time it was: the stars. As the Earth orbits the sun, it shifts toward the sun’s warm embrace. Then summer turns to fall, fall to winter. Soon it loops back around, and winter thaws to spring, spring to summer. Through it all, babies are born from stardust and grow taller. They begin to walk and talk and learn the days of the week, the months, the seasons. Then
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