Two articles are now out concerning time-synchronisation from cosmic events. Last week Illinois proposed using pulsars and today Tokyo wants cosmic rays.
A cosmic event is an instantaneous event visible over many sites, which do not require a human to ping them. They are best for deep space, underwater, wherever else are blindspots.
Only the pulsar-method will work in deep space. Cosmic rays work in (thick) atmospheres when they scatter into mu-leptons and the like; mind, if underwater, one might not be seeing pulsars, for their part.
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