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
    Longitude in
    From: Lars Bergman
    Date: 2019 Jan 3, 11:37 -0800

    Frank, you asked (in A lunar in 1845)
    "Does anyone know (or can anyone suggest) an alternate meaning for "lon in"?"

    The expressions latitude in, and longitude in, were common in connection with traverse table work, or logarithmic traverse calculations. There you always deal with two different positions, the "from" position and the "arrived at" position. These were called latitude/longitude left, and latitude/longitude in, respectively. In my Bowditch from 1851, several examples can be seen in the chapter of Plane Sailing, also in the chapter Methods of Keeping a Journal at Sea. So one guess is that you saw "lon in" in connection with a dead reckoning position, or else it could have been an ordinary a.m. sight for longitude that was brought forward to noon by a traverse table look-up.

    Lars 59°N 18°E

       
    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