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A comment on Amazon Time Sync Service. Parent comment

Re:Amazon Time Sync Service by bogomipz on Thursday November 04, 2021 @01:23AM (#29103856)
One is cesium? Whats the other stuff, way out in space?
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Re:Amazon Time Sync Service by tatersolid on Thursday November 04, 2021 @10:12PM (#29114720)
Some Pulsars have extremely stable frequencies https://www.nytimes.com/1983/02/09/us/pulsar-termed-most-acc...
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Re:Amazon Time Sync Service by baq on Thursday November 04, 2021 @04:16AM (#29104583)
Galileo sats use these

https://www.esa.int/Applications/Navigation/Galileo/Galileo_...

so, basically magic.

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Re:Amazon Time Sync Service by loxias on Thursday November 04, 2021 @09:31PM (#29114506)
You think that's magic, check out optical lattice clocks. Blows my mind every time I re-read about them and accept "yes, this actually works".
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Re:Amazon Time Sync Service by jfrunyon on Thursday November 04, 2021 @02:36AM (#29104105)
Rubidium. Cesium atomic clocks are more expensive.
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Re:Amazon Time Sync Service by tadbit on Thursday November 04, 2021 @02:04AM (#29103979)
GPS
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Re:Amazon Time Sync Service by schwede on Thursday November 04, 2021 @02:23AM (#29104054)
The GPS constellation.
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