Variation of the Earth's rotation derived from timing records of solar eclipse in ancient China.

Physics

Scientific paper

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Earth Rotation: Variations, Earth Rotation: Solar Eclipses

Scientific paper

The authors used 45 timing records of eclipse phases of 32 solar eclipses of ancient China to study the variation of the Earth's rotation. The result, the average increasing of the length of a day is about 1.5 ms/century (the average epoch of the data is about 331 AD), coincides with earlier values based on ancient Chinese timing records of lunar eclipses and on medieval Islamic records of solar and lunar eclipses.

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