The Sumerian clay tablet: Planisphere

The Sumerian clay tablet, known as the “Planisphere” (British Museum collection No. K8538), was discovered in the 19th century by Sir Austen Henry Layard in the library of the Assyrian royal palace at Nineveh, modern-day Iraq.

This circular tablet, inscribed around 700 BC but believed to be a copy of a much older Sumerian record from 3123 BC, has been interpreted as documenting a significant astronomical event. In 2008, British researchers Alan Bond (Managing Director of Reaction Engines Ltd.) and Mark Hempsell (Senior Lecturer in Astronautics at Bristol University) published their analysis in the book A Sumerian Observation of the Köfels’ Impact Event, claiming it describes an asteroid impact.

Key Details of the Tablet and Interpretation

• Content of the Tablet: The tablet is divided into two parts. One half records routine astronomical observations, such as planet positions and cloud cover, typical of a Sumerian astronomer’s nightly log. The other half describes an extraordinary object, referred to as a “white stone bowl approaching,” moving rapidly across the sky. The trajectory of this object, noted with high precision (within one degree), was tracked relative to the constellation of Pisces.
• Date and Event: Using modern computer programs to reconstruct the night sky, Bond and Hempsell pinpointed the observation to just before dawn on June 29, 3123 BC (Julian calendar). They propose this records an asteroid, over a kilometer in diameter, impacting Köfels, Austria.
• Asteroid Characteristics: The object is suggested to be an Aten-type asteroid, a class that orbits close to Earth and resonates with its orbit. Its low incoming angle (around 6 degrees) and collision with a mountain (possibly Gamskogel, 11 km from Köfels) could explain the lack of a traditional impact crater. The asteroid likely disintegrated into a fireball, causing a massive landslide 500 meters (1640 feet) thick and 5 kilometers (3.11 miles) in diameter, which geologists have long puzzled over.

Connection to the Taurids

The Taurid meteor shower, associated with the comet Encke, is known for producing bright fireballs and has been linked to past impact events. Some researchers speculate that the asteroid described in the tablet could be part of the Taurid complex, a stream of debris that intersects Earth’s orbit annually (peaking in October–November).

The tablet’s date of June 29, however, does not align with the modern Taurid shower’s timing, which could suggest either a different orbital configuration of the Taurid stream 5,000 years ago or that the object was not directly related to the Taurids but part of a similar near-Earth object population. The Aten-type orbit proposed by Bond and Hempsell supports the idea of a near-Earth asteroid, which aligns with the Taurids’ general profile.

The Köfels Impact Hypothesis

• Geological Evidence: The Köfels site in Austria features a massive landslide, which mid-20th-century researchers attributed to a meteor impact due to evidence of extreme pressures and explosions. However, the absence of a crater led to skepticism, as typical impact sites have clear craters. Bond and Hempsell argue the low-angle impact and mountain collision caused the asteroid to fragment, producing a fireball and landslide without a crater.
• Controversy Over Dating: Geologists have dated the Köfels landslide to around 9,000 years ago (circa 7000 BC), significantly earlier than the 3123 BC date proposed by the tablet. Hempsell suggested that asteroid debris might have contaminated samples, skewing radiometric dating, but this claim lacks broad support.
• Impact Scale: If accurate, the impact of a mile-wide (over 1 km) asteroid would have been catastrophic, potentially causing tens of thousands of deaths and widespread destruction through shockwaves, a 400°C flash, and debris plumes. Some sources link it to the “4.2 kiloyear event” (circa 2200 BC), a period of global climate cooling and societal collapse, though this date is closer to 2193 BC in some analyses (e.g., a 2019 translation addendum on the K8538 tablet).

Controversies and Criticisms

• Sumerian Astronomical Precision: Critics, such as John Taylor, a retired Near Eastern archaeology expert, argue there’s no evidence Sumerians in 3123 BC could record astronomical trajectories with such accuracy (within one degree). Our understanding of Sumerian cuneiform is also incomplete, raising doubts about the translation.
• Tablet Interpretation: The tablet’s description of a “white stone bowl” is ambiguous, and some scholars question whether it definitively describes an asteroid. Alternative interpretations, like a spaceship (proposed by an Azerbaijani historian), have been dismissed by mainstream academics.
• Sodom and Gomorrah Connection: Bond and Hempsell suggested the impact’s debris plume could have caused destruction in the Sinai, possibly inspiring the biblical Sodom and Gomorrah story. However, biblical chronologies (e.g., Ussher’s) place Sodom’s destruction around 1900 BC, and the tablet’s 3123 BC date precedes the biblical Flood, complicating this link. Critics, including NASA’s David Morrison, call the plume hypothesis “incredible” without further modeling.
• Taurid Link: The Taurid connection is speculative, as no direct evidence ties the tablet’s event to the Taurid stream, and the June date misaligns with the shower’s modern timing.

Additional Notes

• Sumerian Astronomy: The tablet underscores the sophistication of Sumerian astronomy, capable of tracking celestial objects with precision, even if debated. The Planisphere’s survival, despite 40% damage from the sacking of Nineveh, highlights the value of ancient records.
• Cultural Impact: The event, if real, could have left a lasting mark on Mesopotamian culture, potentially influencing myths or records of cataclysmic events. Some link it to the fall of Akkad (circa 2193 BC in later analyses), though this conflicts with the 3123 BC date.
• Public and Academic Reception: The findings, published in 2008, garnered significant media attention (e.g., The Telegraph, Daily Mail) but faced skepticism from cuneiform and impact specialists. The book A Sumerian Observation of the Köfels’ Impact Event (ISBN 1904623646) provides the full translation and analysis for further study.

Conclusion

The Planisphere tablet offers a fascinating glimpse into ancient astronomy and a potential asteroid impact at Köfels, Austria, on June 29, 3123 BC. Bond- British scientists Bond and Hempsell’s interpretation suggests a mile-wide Aten-type asteroid, possibly linked to the Taurid complex, caused a massive landslide without a crater, potentially reshaping our understanding of ancient cataclysms. However, controversies over the tablet’s translation, the Köfels landslide’s dating, and the Sodom and Gomorrah link highlight the need for further research. While the Taurid connection remains speculative, the tablet remains a remarkable artifact, showcasing Sumerian astronomical prowess and fueling debate about ancient impact events. For more details, see A Sumerian Observation of the Köfels’ Impact Event or the British Museum’s K8538 entry.