A medieval parchment from a monastery in Egypt has yielded a surprising treasure. Hidden beneath Christian texts, scholars have discovered what seems to be part of the long-lost star catalogue of ...

Sky-Gazing Medieval Monks Shed Light on Volcanic Mysteries. By observing the night sky, medieval monks accidentally recorded some of history’s largest volcanic eruptions.

The world’s oldest map of the night sky was amazingly accurate. Newly discovered fragments of 2,200-year-old star coordinates—once thought lost—reveal the incredible skill of the ancient ...