[tz] Fwd: Bulletin C number 58

Steve Allen sla at ucolick.org
Sat Jul 27 15:08:03 UTC 2019

On Sat 2019-07-27T01:59:14-0600 Brian Inglis hath writ:
> https://en.wikipedia.org/wiki/ΔT#References has an interesting comment:
> Stephenson, F. R. & Morrison, L.V. "Long-term fluctuations in the Earth's
> rotation: 700 BC to AD 1990". Philosophical Transactions of the Royal Society of
> London, Series A 351 (1995) 165-202. https://www.jstor.org/stable/54464.
> "Includes evidence that the 'growth' in Delta-T is being modified by an
> oscillation with a wavelength around 1500 years; if that is true, then during
> the next few centuries Delta-T values will increase more slowly than is envisaged."

P.J. Huber, 2006, Journal of Geodesy, 80, 283-303
points out that the poor sampling of the ancient data and the
magnitude of the stochastic terms means that the appearance of a 1500
year term could be due only to statistical fluctuation.

Steve Allen                    <sla at ucolick.org>              WGS-84 (GPS)
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