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: Long by Chron - Wikipedia article
    From: David C
    Date: 2020 Aug 17, 14:19 -0700

    Greg wrote

    Perhaps a new article titled Longitude Methods is needed to include the many methods and formulae with references and links.

    I agree. Specific methods could still have their own page. For example a long by chron worked with two latitudes is a chord Sumner. If worked with one latitude and an azimuth is calculated it is a tangent Sumner. Such material probably does not belong in a Longitude Methods page. And remember that two intercept sights determine longitude.

    I am not sure if my 1958 and 1966 copies of Bowditch contain the chapter you mention. I willl check. Wikipedia is very strong on references and it would make things a lot easier if a single Bowditch chapter could be referred to, particularly in the early stage of creating a new page.

    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