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
    From: John Karl
    Date: 2007 Sep 23, 10:16 -0500
    I haven't checked the Nav List for some time.... Now I see some discussion on Lunar Distance Tables this month.
    Some of you may want to check out my new book, Celestial Navigation in the GPS Age, available from, www.celestaire.com  or www.paracay.com .  Among other things, it discusses lunar sights using only the same old  understandable basics of CN, without using tables or approximations -- just a hand calculator and the Almanac.
    BTW, in the book I make the observation that the sun-moon distance changes about one minute of arc per two minutes of time.  So to do better than finding UT to with one minute requires some pretty adroit observing.  And if the LD distance were accurate to one minute of arc, the longitude would be accurate to only about 30'.  Doesn't this explain why the  famous British Parliament Prize was for determining longitude better than 30' of arc?? 
    John Karl

    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to NavList-unsubscribe@fer3.com

    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