Beloved 20th-century astronomer Carl Sagan popularized the notion that humans aren’t just observers of the cosmos, but its descendants—that the matter that makes up our bodies was created in the same moment as the matter that makes up stars and planets.
While this scientific understanding of astronomical lineage is fairly recent, the idea of a relationship between humankind and the heavens is not.
“Across the various pantheons of the ancient world— whether it’s Egyptian, Babylonian, or Greek—the sky is always up there at the top,” says Carolynn Roncaglia, associate professor in the Department of Classics. “It was a pretty common spiritual belief that humans were created from this long line going back to the sky.”
Many early rulers would claim they were descended directly from the gods and, upon dying, they would be brought up to the heavens to live forever among their godly ancestors.
“This was often connected to celestial signs,” Roncaglia says. “For example, when Julius Caesar was assassinated, his nephew, the future Emperor Augustus, argued for Caesar’s divinization, pointing to a comet that was seen in the sky and claiming it was Caesar’s soul going up to the heavens.”
To bolster these divine connections, leaders poured literal blood, sweat, and gold into the construction of political and religious monuments, like the Incan Sun temples or the Egyptian temple of Ramses II at Abu Simbel. Often, these were designed to be dramatically illuminated by the sun’s specific position on solstices or equinoxes—thus reaffirming that ruler’s link to the heavens.
This desire for a personal connection to the stars extended beyond the ruling class. Just as we enjoy reading what our zodiac signs say about us in magazines or BuzzFeed quizzes, everyday people in the ancient world were also fascinated by what it meant to be a Leo or a Sagittarius.
“There was a real belief that if the movement of the heav- ens, the constellations, and the planets can tell when spring is coming, when you should plant crops, and when the Nile is going to flood, why would it not also announce what the rest of your life was going to be like?” Roncaglia explains. “Perhaps, they thought, the night sky could inform a human future as well as a natural future.”
This led to a blending of astronomy and astrology, a blending so deep that in ancient Greece the names of the two disciplines were used interchangeably. In fact, the father of trigonometry, Hipparchus of Rhodes, accurately calculated the orbits, distance between, and sizes of the sun and the moon, all while doing astrology readings on the side.
Eventually, understanding the secrets of the sky became an elite obsession, with nobility and royalty becoming patrons to astronomers and paying large sums of money for astronomical calendars or calculators to show off at parties—the most remarkable example perhaps being the Antikythera mechanism dating from roughly 200 B.C.E.
A culmination of the ancient sciences of Southwest Asia, North Africa, and Europe, the bronze device—often described as the world’s first computer—could predict constellation movements, the orbit of the moon, eclipses, and the positions of five visible planets.
It’s a complete marvel, Roncaglia says, that such a complex device could have been created using nothing more than an abacus and observations made with just the human eye.