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 <[email protected]> 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 >> >> _______________________________________________ >> LEAPSECS mailing list >> [email protected] >> https://pairlist6.pair.net/mailman/listinfo/leapsecs >> > _______________________________________________ > LEAPSECS mailing list > [email protected] > https://pairlist6.pair.net/mailman/listinfo/leapsecs ----------------------------------------------------------------------------- | Richard B. Langley E-mail: [email protected] | | Geodetic Research Laboratory Web: http://gge.unb.ca/ | | Dept. of Geodesy and Geomatics Engineering Phone: +1 506 453-5142 | | University of New Brunswick Fax: +1 506 453-4943 | | Fredericton, N.B., Canada E3B 5A3 | | Fredericton? Where's that? See: http://www.fredericton.ca/ | ----------------------------------------------------------------------------- _______________________________________________ LEAPSECS mailing list [email protected] https://pairlist6.pair.net/mailman/listinfo/leapsecs
