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2.
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StephensonFatoohi, op. cit., 228–9.
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StephensonFatoohi, op. cit., 231.
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StephensonFatoohi, op. cit., 233.
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StephensonF. R.MorrisonL. V., “Long-term changes in the rotation of the Earth: 700 b.c. to a.d. 1980”, Philosophical transactions of the Royal Society of London, A, cccxiii (1984), 47–70, Fig. 2(a).
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StephensonF. R., “Accuracy of medieval Chinese measurements of lunar and solar eclipse times”, in NhaIl-SeongStephensonF. R. (eds), Astronomy from Guo Shoujing to King Sejong (Seoul, in press).