Welcome to the NavList Message Boards.

NavList:

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

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Lunar distance measurement in ideal conditions: attainable accuracy.
    From: Alexandre Eremenko
    Date: 2013 Jan 8, 00:22 -0500

    Dear Bill,
    
    > Well the ratio of the variances of the index errors is 2.07, which is
    > nearly 2.12, the f-ratio for significance at the 5% level. I don't really
    > know what I'm talking about
    
    One does not need to know all these variations, and even less f-ratios:-)
    Just look at your error column with your naked eye.
    In lunar-1 your error varies from -0'2 to +1.8 and it is at least 1'
    in almost half of all observations.
    In lunar-2 the error is always between -0'3 and +0'3. And it is between
    -0'1 and +0'1 in more than half of the shots.
    
    Without any knowledge of statistics you can tell that lunar-2 is excellent,
    and lunar-1 is "so-so":-)
    Usually a lot of practice is required to achieve such progress.
    
    > "How does Cook describe his position...?
    >
    > Cook writes "...Cape St Diego bore at that time SBE (south by east)
    > distant about 4 leagues."
    
    Is Cape St Diego the most Eastern end of Tierra del Fuego?
    Google maps does not react on "Cape St Diego".
    If my understanding of what is Cape St Diego is correct than the author
    of the footnote has the latitude wrong:-)
    
    Which raises a general question:
    
    Do there exist any GOOD geographical maps on the Internet?
    I mean the maps which have
    islands and straits and capes names in the uninhabited areas like Canadian
    Arctic, for example. I recently read a book on Polar exploration, the book
    did not have
    good maps and I started looking on Internet. Google gives contour maps
    of those areas without any labels of islands, straits, capes and other
    geographical features. And to my surprise I was unable to locate any
    reasonable maps.
    
     Alex.
    
    
    
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    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:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    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