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: The Sun does not stop for anyone
    From: John D. Howard
    Date: 2016 Dec 24, 09:08 -0800


    Azimuths are plotted on plane paper ( charts ) all the time.  A universial plotting sheet the cel navagators use to plot is plane - NOT Mecador.

    You plot the azimuth from your position ( AP, DR, MPP, GPS, etc. ) and the azimuth is valid.

    Agreed, you  could not sail for hundreds of miles on a heading derived from a plane chart but that is not what you are doing.  You are plotting a bearing from where you are standing to the sun just like any bering.  Because the intercept is short - up to 30 NM - the angles the azimuth cross all the meridians is the same to a tiny amount.

    If you are plotting from a fixed position on land there is no reason to even draw meridians other than the center one - the one you are on.

    After all the LOPs are plotted you measure the delta Lat. by whatever NM scale you were using and the delta Lon. by distance from your position horzonatily th the fix then multiply by the cosine of your Latitude.

    Many people think the plotting sheets are Mecator but they are not.

    John H.

    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