Around 3,000 BC, an ancient Sumerian astronomer was observing the sky as he usually would. While he was making observations, he wrote down the position of the planet and other astronomical data on a clay tablet, a star map. But this time, the sky was different. He noticed that there was something in the sky that wasn’t there before. It was bright, and it was moving.
A 5,100-year-old clay tablet discovered in the 19th century in the underground library of King Ashurbanipal in Nineveh is an astronomical treasure. The ancient “document” excavated in present-day Iraq by Sir Henry Layard offers unprecedented insight into astronomical observations that took place more than 5,100 years ago in ancient Mesopotamia.
The object is held at the British Museum and cataloged as artifact No. K8538, and it is an ancient star map. The artifact was translated over ten years ago with the help of computer software that helped scientists simulate trajectories, and reconstruct the night sky thousands of years ago. This allowed experts to understand its significance and reveal a message written by ancient skygazers.
The clay tablet is a copy of a set of notes inscribed by an ancient Sumerian astronomer who witnessed the approach of a massive asteroid. The Sumerian astronomer referred to the cosmic body as “a white stone bowl approaching from the sky…”
The translated clay tablet tells how an ancient Sumerian astronomer observed on 29 June 3123 BC a massive asteroid approaching Earth. It smashed through our planet’s atmosphere and made its way to the surface.
But the clay tablet is so much more than just a map with drawing of constellations and their names. It offers incredible data that has never before been seen by experts. One side of the clay tablet describes the position of several cosmic bodies in the night sky and the weather conditions of the time. The other half of the clay tablet makes reference to the “white stone bowl approaching from the sky…”
The Sumerian astronomer not only described the object, but managed to make a note of the object’s trajectory relative to the stars, and he did so with amazing precision; experts say that the trajectory of the asteroid was recorded to an error of less than one degree.
This allowed modern scholars to stimulate the trajectory of the space rock and conclude that it most likely impacted in Europe. In fact, experts believe that the asteroid described by the Sumerian astronomer may have struck in Kofels, Austria. Based on the data etched on the clay tablet, experts believe that the space rock witnessed by the Sumerian astronomer was most likely around one kilometer in diameter.
Data written on the star map offers clues as to why there are no impact craters of the object; the asteroid’s incoming angle was very low, as low as six degrees.
This tells us that the space rock may have actually clipped a mounting on its way forward—this was probably the very summit of Gamskogel—which caused the asteroid to disintegrate before reaching the surface. This impact produced extremely high-pressure, which essentially pulverized the space rock.