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: The 57 Navigational Stars (and Zuben'ubi)
    From: Fred Hebard
    Date: 2005 Apr 22, 10:40 -0400

    On Apr 21, 2005, at 9:42 PM, Herbert Prinz wrote:
    
    > It is true, since Polaris is always nearly on the meridian, a shot of
    > Polaris can give a very good latitude, if (!) one has local time; but
    > this feature is inherent in the geometry of the observation, not in the
    > method of reduction. Therefore, there is no need to make head stands
    > for
    > a special method of reduction. Besides, since Sumner's great discovery,
    > we have come to understand that latitude is just one specially named
    > line of position.
    >
    
    Part of the attraction of Polaris may have been that it is a relatively
    easy calculation that a tired mariner could rely on more strongly than
    other lines of position.  Also, the Hs only differs from the colatitude
    by less than a degree, so there is an inherent check to the
    calculation.  And then there's tradition....
    
    Fred
    
    
    

       
    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