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    Re: A quarter-millennium of almanacs
    From: Alexandre Eremenko
    Date: 2017 Sep 14, 12:22 +0000

    I inspected my almanac, and found
    two things are unpredictable:
    The list of public holidays in UK and US (this can be changed by decisions of parliaments), and
    Standard times (in various countries). 
    From: NavList@fer3.com [NavList@fer3.com] on behalf of Frank Reed [NoReply_FrankReed@fer3.com]
    Sent: Wednesday, September 13, 2017 8:16 PM
    To: eremenko@math.purdue.edu
    Subject: [NavList] A quarter-millennium of almanacs
    I just wanted to remind everyone that this year, 2017, is the 250th 
    anniversary of the first official year of "The Nautical Almanac and 
    Astronomical Ephemeris". It was ready for sale right at the beginning of the 
    year 1767 itself. 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. And I mean that: 
    it's a puzzle! What is it about the way astronomical data in the modern 
    Nautical Almanac is presented that is different from the way it was a century 
    or two centuries ago that makes it more problematic to publish ahead? Why 
    can't you buy the official Nautical Almanac for the year 2020 today?
    Frank Reed
    View and reply to this 

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