James Aitcheson Recasts Eilmer's Flight Timeline With 1018 Comet Theory

Q: A flying monk in England, an engineer in Spain: who was the true father of flight in the Middle Ages?

Abbas ibn Firnas of al-Andalus has the stronger claim to being the Middle Ages’ “father of flight,” though Eilmer of Malmesbury remains one of medieval Europe’s most remarkable aviation pioneers. The case for Ibn Firnas rests on priority and method. He is reported to have attempted flight near Córdoba in 875, more than a century before Eilmer’s jump from Malmesbury Abbey. Medieval and later accounts describe him as a polymath who studied bird flight, built a winged apparatus, and managed a sustained glide before injuring himself on landing. Crucially, tradition holds that he recognized the need for a tail to improve control and landing stability, giving him a reputation as an early aeronautical thinker rather than merely a daredevil. Eilmer’s feat, documented by William of Malmesbury, is better known in England and unusually well remembered. He launched himself from a 150-foot tower with wings of willow and cloth and reportedly glided about 600 feet before breaking both legs. His own explanation for the crash—that he had forgotten a tail—shows a strikingly similar aerodynamic insight. New research has reopened debate over when he flew, possibly later than the traditional 1000–1010 dating, but that does not alter his importance as an early experimenter. If the question is who flew earliest and approached flight most like an engineer, Ibn Firnas leads. If the question is who best symbolizes medieval Europe’s dream of human flight, Eilmer is the standout figure.

Q: Should Halley's Comet be renamed for a monk who saw its pattern centuries before Halley?

No. Eilmer of Malmesbury’s story is historically fascinating, but the case for renaming Halley’s Comet is too weak. The evidence that Eilmer recognized the comet’s periodic return is intriguing, not definitive. The main source is William of Malmesbury, writing decades after Eilmer’s death. William says Eilmer, old in 1066, recalled seeing the comet in his youth, but modern historians disagree on what he actually saw. James Aitcheson argues the earlier sighting may have been the comet of 1018 rather than Halley’s Comet in 989, which would undercut the claim that Eilmer identified a repeating 76-year pattern. Even if Eilmer did connect the 1066 comet with an earlier one, that is different from what Edmond Halley achieved. Halley did not merely notice a resemblance; he used Newtonian physics and historical records to show that the comets of 1531, 1607 and 1682 were the same object and correctly predicted its return in 1758. That predictive, mathematical proof is why the comet bears his name. There is also little precedent for renaming such a famous, long-established object, and any change would fall to the International Astronomical Union. Nothing in current naming practice suggests momentum for revising a historic comet name on this basis. Eilmer deserves more recognition in the history of astronomy, much as he does in the history of flight. But that is a stronger argument for honoring him separately than for replacing Halley’s name.

1 articles · Updated · Ars Technica · Jun 14

Aitcheson argues Eilmer’s youthful comet sighting may have been the 1018 comet, not Halley’s 989 appearance, challenging the standard basis for dating the monk’s flight.
That matters because William of Malmesbury wrote that Eilmer, “advanced in years” in 1066, told Halley’s comet, “It is long since I saw you,” a line many historians took as proof he had seen it in 989.
Under that older reading, Eilmer had to be born by 984 and his winged leap from Malmesbury Abbey’s 150-foot tower likely fell between 1000 and 1010.
If the earlier sighting was instead the 1018 comet, Aitcheson says Eilmer could have been born later, shifting the attempted 600-foot glide into the 1020s to 1040s.

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Ars Technica4h ago

James Aitcheson Challenges Eilmer's Halley's Comet Sighting, Suggests 1018 Comet

A flying monk in England, an engineer in Spain: who was the true father of flight in the Middle Ages?

Should Halley's Comet be renamed for a monk who saw its pattern centuries before Halley?

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Ars Technica4h ago

James Aitcheson Challenges Eilmer's Halley's Comet Sighting, Suggests 1018 Comet

James Aitcheson Recasts Eilmer's Flight Timeline With 1018 Comet Theory

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