[LEAPSECS] leap in june

[Richard B. Langley]

Not sure I am permitted to distribute the paper through this list. The following includes a link to the JSTOR archive:

The Secular Increase in the Length of the Day
Harold Spencer Jones
Proceedings of the American Philosophical Society
Vol. 99, No. 4 (Aug. 30, 1955), pp. 195-199
Published by: American Philosophical Society
Stable URL: http://www.jstor.org/stable/3143697
Page Count: 5

-- Richard Langley

On Friday, January 9, 2015, 9, at 3:23 PM, Pierpaolo Bernardi wrote:

> 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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| Richard B. Langley                            E-mail: lang at unb.ca         |
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