Researchers are on an exciting mission to uncover the oldest-known map of the night sky. This valuable piece of history was believed to be lost forever, hidden beneath layers of medieval text on a parchment. Their efforts involve X-raying a manuscript from the 6th century that may contain the ancient star map attributed to Hipparchus, a legendary astronomer who lived around 190 to 120 BCE.
Hipparchus is considered the first to catalog stars in a meaningful way. Before this project, the only surviving work from him was a commentary on other star-related texts. In 2022, scientists noticed signs of an ancient star map in a manuscript called the Codex Climaci Rescriptus.
Because parchment was expensive in the Middle Ages, it was often scraped clean and reused, making this discovery even more remarkable. Earlier attempts showed underlying astronomical references, but the 2022 findings linked these to the Earth’s precession, suggesting they are from Hipparchus’s time.
The current restoration process uses advanced technology at the SLAC National Accelerator Laboratory, where researchers apply X-ray scans. This method helps identify different materials without damaging the fragile manuscript. Victor Gysembergh, a historian involved in the project, expressed excitement about recovering these ancient coordinates. He highlighted how accurately Hipparchus understood celestial movements, achieving remarkable precision with just the naked eye.
The scanner in use is a synchrotron, which produces X-rays by rapidly accelerating electrons. This allows researchers to differentiate between the layers of ink while preserving the manuscript’s integrity. The original text, which is in Greek, contains unique signatures that provide clues for recovery.
So far, a few star descriptions have been uncovered, along with a reference to the constellation “Aquarius.” This advancement opens the door to revealing more of Hipparchus’s work as researchers continue to scan the remaining pages.
The Codex Climaci Rescriptus, initially recovered from St. Catherine’s Monastery in Egypt, has traveled to the SLAC lab for careful analysis. Transporting this fragile manuscript wasn’t easy; each page is held in custom frames, kept in a controlled environment to prevent damage.
Despite the hurdles ahead, the potential to reconstruct the first-ever night sky map is thrilling. With just 11 pages currently being scanned of the 200 that make up the manuscript, scientists will need to coordinate access to more pages scattered around the globe.
The excitement from experts like Gysembergh is palpable. As they recover more ancient Greek text, they draw closer to answering fundamental questions about the beginnings of astronomy and human knowledge.
For further insights into these discoveries and their implications, you can read more from KQED.
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