Addendum 2020 to ‘Measurement of the Earth’s rotation: 720 BC to AD 2015’
2021 ◽
Vol 477
(2246)
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pp. 20200776
Keyword(s):
The Sun
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Historical reports of solar eclipses are added to our previous dataset (Stephenson et al. 2016 Proc. R. Soc. A 472 , 20160404 ( doi:10.1098/rspa.2016.0404 )) in order to refine our determination of centennial and longer-term changes since 720 BC in the rate of rotation of the Earth. The revised observed deceleration is −4.59 ± 0.08 × 10 −22 rad s −2 . By comparison the predicted tidal deceleration based on the conservation of angular momentum in the Sun–Earth–Moon system is −6.39 ± 0.03 × 10 −22 rad s −2 . These signify a mean accelerative component of +1.8 ± 0.1 × 10 −22 rad s −2 . There is also evidence of an oscillatory variation in the rate with a period of about 14 centuries.
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Keyword(s):
1979 ◽
Vol 82
◽
pp. 7-18
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1979 ◽
Vol 82
◽
pp. 55-57
2008 ◽
Vol 104
(1)
◽
pp. 150-154
1980 ◽
Vol 78
◽
pp. 235-237
Keyword(s):