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Period of Halley's Comet's orbit (75.3 y) is 2.5 x Lifespan of horse (30 y)
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Duration of Ming Dynasty (276 y)
If this was a standard unit ...
Yes, there's now a book based on these numbers. Oxford University Press: July 2018.
Click here to learn more about it.
Click here for Podcast: Andrew Elliott interviewed for New Books Network.