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Historical Eclipses and Earth's Rotation: 700 BC-AD 1600

机译:日食和地球自转:公元前700年至公元1600年

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For the whole of the pre-telescopic period, eclipse observations have proved to be by far the best data with which to determine changes in the Earth's rate of rotation. These changes - on the scale of milliseconds - are produced by both the tides and a variety of non-tidal mechanisms. Each individual observation leads to a result for AT (the cumulative effect of changes in the Earth's spin rate). Over a period of many centuries, this parameter can attain several hours and thus can be determined using fairly crude observations. Recently I have extended previous investigations by introducing hitherto unused observations and reinterpreting some of the more reliable existing data: especially in the periods from 700 BC to 50 BC and from AD 300 to 800. This has led to the derivation of revised AT values over much of the historical period.
机译:在整个望远镜前时期,日食观测已被证明是确定地球自转速率变化的最佳数据。这些变化(以毫秒为单位)是由潮汐和各种非潮汐机制共同产生的。每个单独的观察都会得出AT的结果(地球自旋速率变化的累积影响)。在多个世纪的时间里,此参数可以达到几个小时,因此可以使用相当粗略的观测值来确定。最近,我通过引入迄今未使用的观测值并重新解释了一些更可靠的现有数据来扩展了以前的研究,尤其是在从公元前700年到50 BC以及从公元300年到800年的时期。历史时期。

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