It bothered Baley that the books he viewed made none of this clear. But then, from his own knowledge of Earth’s history, he knew that, at one time, the lunar month had been the key to the calendar and that there had come a time when, for ease of chronometry, the lunar month came to be ignored and was never missed. Yet if he had given books on Earth to some stranger, that stranger would have very likely found no mention of the lunar month or any historical change in calendars. Dates would have been given without explanation. What else would be given without explanation? How far could he rely,
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