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Comment by saulpw | Hacker News Reader

A cesium stopwatch: https://en.wikipedia.org/wiki/Caesium_standard

How deep in a gravity well are you planning to keep this cesium stopwatch?

Exactly at the point of Null Island at the epoch, of course. Or, in practice, as close an approximation as can be calculated by now.

Fun reference, although in that spirit it appears that Null Island at mean sea level for that point might be as much as 22m vertical separation from true 1G Geoid.

https://en.wikipedia.org/wiki/Geoid#/media/File:Geoid_undula...

Approximations are pretty easy until you get into the details, dammit.

Not at all what was asked for; not available as a handheld stopwatch someone could stand with in 1970 ... and I'm doubtful there's such a thing available today.

Works if you don't mind a lab bench full of equipment, but doesn't appear to match the specification of the request.

Still, thanks for your input.

Handheld was never specified directly, just “stood with a” which can just mean “next to.”

The HP 5061 was introduced in 1964, why do you think a counter that can reference the frequency standard is not possible?

You might want to be more rigorous about reading specifications.

The HP 5061 is not a handheld stopwatch, at best it's a counter top luggable.

> why do you think a counter that can reference the frequency standard is not possible?

How on earth did you strawman my thinking to reach that bogus conclusion?

You might want to be more rigorous about reading comments and projecting.

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