The stars have always fascinated poets and astronomers alike. Early Greek philosophers imagined a music of the spheres—a musica universalis—produced by the heavenly bodies. The sun, moon, planets, and stars, said Pythagoras, all emit their own unique hum, an orbital resonance based on the mathematical harmony of their movements. Number, motion, harmonics, mystery: These are the rhetoric of the stars. Origen of Alexandria, the third-century Christian theologian, drew on Plato and others before him in contending that the stars were living beings, actively engaged in praising God and assisting human life. In the twelfth century, the Mississippian people at the Cahokia Mounds site near East St. Louis carefully studied the rising of the sun and stars at important times of the year. The Cahokians created a habitable cosmos by perceiving the stars as the living source of their cultural and religious life. They built more than a hundred mounds and five wood-henges in order to carefully measure solstices, equinoxes, and star risings. They monitored the ascent of celestial objects like Venus and the star cluster we know as the Pleiades. On the winter solstice, the author spends a cold, wet night atop Monk’s Mound, awaiting the rising of the Pleiades himself.