Variations in the Earth's clock error ΔT between AD 300 and 800 as deduced from observations of solar and lunar eclipses
Stephenson, F. Richard (2007) Variations in the Earth's clock error ΔT between AD 300 and 800 as deduced from observations of solar and lunar eclipses. Journal of Astronomical History and Heritage, 10 (3). pp. 211-220.
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Historical observations of solar and lunar eclipses provide the most effective method of tracing fluctuations in the Earth's rate of rotation in the pre-telescopic period. However, the temporal distribution of these data - some of which extend back to 700 BC - is far from uniform. Between AD 300 and 800, no more than about fifty usable observations are preserved. Analysis of these data enables variations in the Earth's clock error, ΔT, to be enumerated with tolerable precision during this interval. It is shown that departures from a parabolic fit are fairly small.
|Item Type:||Article (Refereed Research - C1)|
|Keywords:||astronomical history; solar eclipse; lunar eclipse|
Reproduced with permission from Journal of Astronomical History and Heritage.
|Date Deposited:||22 Jul 2009 05:23|
|FoR Codes:||02 PHYSICAL SCIENCES > 0299 Other Physical Sciences > 029999 Physical Sciences not elsewhere classified @ 100%|
|SEO Codes:||97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%|
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