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Random Useless Fact Generator

It is mathematically impossible to create a calendar that matches the cycle of the heavens and keeps in synch with the seasons. The mean tropical year, the time that it takes for the Sun to return to the same position in the heavens, is, to six decimal places, 365.242189 days, and isn't exactly expressible as an exact fraction, so it isn't practical to create a calendar with a cycle that exactly matches the length of the mean tropical year.

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