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: A Sun-compass landfall?
    From: David Pike
    Date: 2021 Apr 11, 11:22 -0700

    Geoffrey Kolbe wrote: Surely the whole point about a sun compass is that you keep adjusting it for local time...?

    Geoffrey
    To add a bit more.  The way I read the original question was "Could you keep the Sun in the same position relative to the aircraft", which of course you can’t.  The Sun’s relative bearing would gradually move forwards or backwards depending upon which direction you approached your destination from. 

    Yes, if you increased the Sun compass azimuth reading by one degree every four minutes making a further allowance for your rate of change in longitude, you would maintain the same heading.  However, at a time when you need maximum time for looking ahead for your destination, wouldn’t it be easier to follow that heading on your steering compass, and directional gyro.  Of course, if a Sun compass were all you had, you’d have to keep tweaking the azimuth setting. 

    A Mars Bar for the first person to come up with a formula for the time between one-degree tweaks bringing in latitude, groundspeed and track.  Two Mars Bars for three nomograms to achieve the same answer. DaveP

       
    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