Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: A quarter-millennium of almanacs
    From: Stan K
    Date: 2017 Sep 13, 22:50 -0400
    Could it have something to do with Delta-T estimates?  Or, perhaps, leap-seconds?  Or the possibility that nobody will be using Nautical Almanacs in 2020, so why bother publishing them?


    -----Original Message-----
    From: Frank Reed <NoReply_FrankReed@fer3.com>
    To: slk1000 <slk1000@aol.com>
    Sent: Wed, 13 Sep 2017 20:18
    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
    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.

    Email Settings

    Posting Code:

    Custom Index

    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site