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- W2109634621 abstract "This paper summarises recent research on long-term variations in the Earth's past rotation. A variety of ancient and medieval observations of both solar and lunar eclipses are investigated to determine changes in the length of the day (LOD) between 700 BC and AD 1600. These data originate from Babylon, China, Europe and the Arab world. In all, some 400 individual observations - both timed and untimed - are analysed. The results indicate an average rate of increase in the LOD by 1.7 milliseconds per century (ms/cy), considerably less than that calculated on the basis of lunar and solar tidal friction alone (i.e. 2.3 ± 0.1 ms/cy). The residual mean non-tidal decrease in the LOD by about 0.6 ms/cy is in good accord with that expected on the basis of post-glacial isostatic compensation. However, there is also some indication of long-term fluctuations in the LOD of amplitude some 4 ms on a time-scale of around 1500 years. Possible causes are core-mantle coupling and variations in global sea-level associated with climatic fluctuations." @default.
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- W2109634621 date "2000-11-01" @default.
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- W2109634621 title "Book Review: Basic and Applied Sciences for Sports Medicine; Ron J. Maughan (Ed); Butterworth Heinemann, 1999; ISBN 0 7506 3466 9, 357 pp" @default.
- W2109634621 doi "https://doi.org/10.1054/ptsp.2000.0018" @default.
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