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
    Nomogram for Dip Short of Horizon
    From: Robin Stuart
    Date: 2018 Mar 18, 13:28 -0700

    Recent threads on nomography prompted me to revisit that topic and as an exercise I have produced a couple of nomograms to calculate dip short of the horizon which I think are an improvement on the one mentioned here .

    Draw a line from the “Height of Eye” scale through the desired “Distance to Waterline” and read off the Dip Short where it intersects the “Dip Short of Horizon” axis on the right.

    Other scales to the left give the dip and horizon distance for a given height of eye. Actually these can also be crudely extracted from the dip short nomogram itself. Draw a line from the “Height of Eye” scale that is tangent to the “Distance to Waterline” curve and extend it until it intersects the “Dip Short of Horizon” axis. The intersection point is the dip of the horizon and the point of tangency is the horizon distance. These nomograms have the nice feature that the “Height of Eye” and “Dip Short of Horizon” are linear and therefore are easily extended for values outside the given range.

    Comments, suggestions?

    Robin Stuart

    File:
    DipShortNomogram4.pdf
    File:
    DipShortNomogram5.pdf
       
    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