Particle acclerator dudes find earliest known star catalog under St. John of the Ladder overwrite

2nd Century BC doc by Hipparchus is “earliest known attempt to record accurate coordinates of many celestial objects observable with the naked eye"

Medieval Monks Wrote Over a Copy of an Ancient Star Catalog. Now, a Particle Accelerator Is Revealing the Long-Lost Original Text - Featured Image

TLDR

Medieval monks at Saint Catherine’s Monastery in Egypt reused expensive parchments by erasing old writings and replacing them with new texts, creating palimpsests. Researchers at SLAC National Accelerator Laboratory are now using particle accelerators to reveal the original texts, including a star catalog from the second century B.C.E. by the Greek astronomer Hipparchus.