[Bobalu]

I use a lot of crystals at 32.768KHz for timekeeping in embedded systems.

My timekeeping is an order of magnitude less accurate than these atomic clocks.

GPS is one area that depends upon extremely accurate time keeping.

[JoeProBono]

[cynwoody]

I use a lot of crystals at 32.768KHz for timekeeping in embedded systems.

My timekeeping is an order of magnitude less accurate than these atomic clocks.

NIST-F1 has a frequency uncertainty of 3e-16. That's ±1 second in 100 million years. What's that in orders of magnitude?