When you drive through the Texas Pandhandle at night, squaremiles of electric windmills blink together – like fireflies stirring across flatlines of [L]one-star horizon.

They've been simultaneous for decades... and remains a breathtaking detour (if you're out there, schedule night-travel).

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I like the similar project which uses GPS signal offsets, captured on a RaspberryPi, to then broadcast (e.g:) a local-network-timeserver.