Did a medieval flying monk spot Halley's comet, twice? It's complicated
University of Leicester historian thinks Eilmer of Malmesbury saw two different comets: in 1018 and 1066
University of Leicester historian thinks Eilmer of Malmesbury saw two different comets: in 1018 and 1066 This report comes from Ars Technica. The sto
Read Full Story at Ars Technica →Why This Matters
The possibility that a 11th-century monk witnessed Halley’s Comet twice—first as a young man and again on his deathbed—challenges our understanding of medieval astronomy and the transmission of scientific knowledge. If confirmed, it would underscore how pre-modern observers, often dismissed as superstitious, made remarkably precise celestial observations that laid groundwork for later astronomical advancements.
Background Context
Eilmer of Malmesbury, a Benedictine monk recorded in the 11th-century chronicle *De Gestis Regum Anglorum*, is one of the few named figures from medieval Europe whose astronomical observations survive. His account, written decades later, describes a comet that fell to earth near a monastery—an event likely tied to Halley’s Comet’s 1066 apparition. Yet the comet’s 1018 appearance also aligns with historical records, raising questions about whether Eilmer’s later description conflated two separate events.
What Happens Next
Further scrutiny of medieval chronicles and astronomical calculations could refine the dating of Eilmer’s observations, potentially resolving whether his account reflects two distinct apparitions or a single, vivid memory distorted by time. Scholars may also revisit other medieval texts for overlooked celestial references, while astronomers could model Halley’s historical trajectory with greater precision. The debate also highlights the need for interdisciplinary collaboration between historians and scientists to decode ancient records.
Bigger Picture
This story fits into a broader reassessment of medieval scientific literacy, where monks and scholars often acted as the era’s primary record-keepers of natural phenomena. It also mirrors modern efforts to reconcile historical texts with empirical data—a trend seen in climate science, archaeology, and even space exploration. The case of Eilmer of Malmesbury serves as a reminder that the roots of systematic observation stretch far deeper than the Renaissance, challenging linear narratives of scientific progress.
