At a cryonics social event yesterday Keith Henson mentioned a mysterious cosmic event in 774 or 775 which appears drastic enough that if it were to repeat today it would likely destroy all technology in orbit, and possibly enough planetary electronics to cause major problems. People are wondering why it apparently didn’t wipe out the ozone layer.
Attempts to find historical records of observed anomalies from that time have so far only produced a few vague hints.
> Analysis of two ancient trees
It’d be nice to know that there’s something there to be explained before speculating. And chronicles are full of lights and portents in the sky, so looking in them without nailing down what counts is just begging for confirmation bias.