Coincidentally, Facebook just released a solution to this problem: To remove these dependencies, we’ve built a new dedicated piece of hardware called Time Appl

Coincidentally, Facebook just released a solution to this problem: To remove these dependencies, we’ve built a new dedicated piece of hardware called Time Appliance, which consists of a GNSS receiver and a miniaturized atomic clock (MAC). Users of time appliances can keep accurate time, even in the event of GNSS connectivity loss. While building our Time Appliance, we also invented a Time Card, a PCIe card that can turn any commodity server into a time appliance. https://engineering.fb.com/2021/08/11/open-source/time-appliance/ https://engineering.fb.com/2021/08/11/open-source/time-appli... https://news.ycombinator.com/item?id=28140732 https://news.ycombinator.com/item?id=28140732 I didn't even know that a "Miniaturized Atomic Clock" was a thing. Looks like they cost a couple thousand dollars, but that's probably not a bad price for what you get. https://www.sparkfun.com/products/14830 https://www.sparkfun.com/products/14830