[LEAPSECS] leap in june

[Pierpaolo Bernardi]

Markus Kuhn writes: "The varying length of the day has been known for
centuries but only became a practical concern (outside astronomy) with
the invention of atomic clocks in the 1950s."

Is this true?  I though it was discovered only in the 20th century?
>From the context he refers to mean solar day, I understand.


On Fri, Jan 9, 2015 at 2:24 PM, Tom Van Baak <tvb at leapsecond.com> wrote:
> They were wise enough to ask Markus to write it; a nice balance between
> popular and technical. They were kind enough to ask permission to use a
> cesium clock leap second photo from my web site. "Not something you see
> every day" indeed!
>
> https://theconversation.com/an-extra-second-on-the-clock-why-moving-from-astronomic-to-atomic-time-is-a-tricky-business-35970
>
> Markus -- your LOD plot ends in 2011?
>
> /tvb
>
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