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I synchronized the clocks on my oven and microwave (programming.dev)
submitted 1 week ago by to c/Dullsters@dullsters.net
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Now there's no noticeable delay between when they update.

Here's the process I used https://alexsci.com/blog/preparing-to-change-the-clocks/

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[–] 3 points 1 week ago*

NTP is accurate within a few milliseconds. GPS is accurate within a few microseconds. However, you need to hook into the PPS (pulse per second) on the GPS signal to get proper accuracy. Think of it like a super-precise drummer keeping beat. NTP servers typically use GPS as a primary time source.

Source: I operate a stratum-1 time server in the NTP pool.

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