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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Ancient eclipses and long-term drifts in the Earth-Moon system.
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Ancient eclipses and long-term drifts in the Earth-Moon system.

机译：地球月球系统中的古代月食和长期漂​​移。

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摘要

We study anomalies in the Earth-Moon system using ancient eclipse data. We identify nine groups of anomalous eclipses between AD 400 and 1800 recorded in parts of India that should have completely missed the subcontinent according to NASA simulations (Espenak, F. and Meeus, J., NASA/TP 2006-214141, 2011). We show that the typical correction in lunar location required to reconcile the anomalous eclipses is relatively small and consistent with the fluctuations in the length of day that are observed in recent periods. We then study how the change in the moment of inertia of the Earth due to differential acceleration of land and water can account for this discrepancy. We show that 80% of these discrepancies occur when the Moon is at a declination greater than 10 and closer to its major standstill of 28 while it spends 46% of the time in this region. We simulate the differential interaction of the Moon's gravity with land mass and water using finite element method to account for land mass and watermass. We show that the results of eclipse error are consistent with the estimate of a small differential acceleration when the Moon is over land at high latitudes. However, we encounter some examples where the results from simulation studies cannot explain the phenomenon. Hence we propose that the Delta T corrections have to be coupled with some other mechanism, possibly a small vertical oscillation in the Moon's rotational plane with period of the order of a few hundred years to achieve the required adjustment in eclipse maps.
机译：我们使用古老的月食数据研究了地球-月球系统中的异常。根据美国宇航局的模拟，我们确定了在印度部分地区记录的公元400年至1800年之间的九次异常月食，它们应该完全错过了次大陆（Espenak，F.和Meeus，J.，NASA / TP 2006-214141，2011）。我们显示，调和异常月食所需的月球位置典型校正量相对较小，并且与最近时期中观察到的日长波动一致。然后，我们研究由于土地和水的不同加速度而引起的地球惯性矩的变化如何解释这一差异。我们显示，当月球偏角大于10且接近其主要停顿状态28时，其中80％的误差发生在月球上，该时间花费了该地区46％的时间。我们使用有限元方法模拟了月球重力与土地质量和水的微分相互作用，以说明土地质量和水质。我们显示，当月球在高纬度的陆地上时，日食误差的结果与小微分加速度的估计值一致。但是，我们遇到了一些例子，其中模拟研究的结果无法解释这种现象。因此，我们建议将Delta T校正与其他机制耦合，可能需要在月球自转平面上进行小的垂直振荡，周期约为数百年，以实现日食图的所需调整。

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