BEACON TRANSCRIPT ̵
Some of these medieval tapestries show comets in the sky about scenes of knights, kings, armies, and life in the Middle Ages. One such famous example is the Bayeux Tapestry completed in 1077. This celebrates the exploits of William the Conqueror. It is believed that the tapestry shows Halley's Comet at an upper bound of its fabric.
Medieval tapestries and scrolls interweave with modern research
Astronomers can use orbital mechanics to represent the exact position of known comets. That way they can see where they are at any given time in history. Then this information can be compared with today's data. Moreover, medieval tapestries were almost always carefully dated by their creators.
The positions of the comets depicted in medieval tapestries and ancient scrolls are compared to all available computer models for the so-called Planet Nine.
If such a planet actually exists, these ancient sources could reveal new information. The gravitational disturbances in the orbits of medieval comets can be detectable. This could indicate the existence of the mysterious planet.
Planet Nine must not be confused with Pluto. Of course, the ninth planet of our solar system was Pluto. However, this was demoted to dwarf planet status by the International Astronomical Union in 2006.
The possibility of this new ninth planet was already proposed in 2014. Its theoretical existence is largely based on observations of planetoids, ice balls and comets in the Oort cloud. This is a collection of objects that surround our sun at extreme distances.
Gravitational influences observed in Oort cloud objects indicate the existence of a yet-to-be-discovered planet somewhere in our solar neighborhood. This would have to be an orbit around the Sun, about 20 times farther than Neptune's. It would also have about ten times the mass of our planet.
Both astronomers and historians recognize the astute observational skills of the Anglo-Saxon scholars of the Middle Ages. Their observations can be traced and studied through a variety of ancient scrolls. The data they collected about comets centuries ago could prove useful in our day, too.