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    Re: A quarter-millennium of almanacs
    From: David Pike
    Date: 2017 Sep 14, 00:00 -0700

    The human computers working in England were busy bees in the year 1767 and after, and it wasn't long before they were five years ahead of the calendar. It's a bit of a puzzle that you can't buy a modern Nautical Almanac for a year five years ahead of the calendar today.

    Perhaps it was to do with the length of time before you could next visit a decent book shop.  E.g. Cook’s voyages from August 1768 3 years, 3 years, and 4 years. DaveP

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