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: A Sun-compass landfall?
    From: David Pike
    Date: 2021 Apr 9, 01:28 -0700

    Gary LaPook wrote: No

    I’m pleased Gary answered this whilst I was sleeping on it.  I’d have taken two pages to say exactly the same thing.  Unfortunately, the Sun isn’t very cooperative.  It keeps moving all the time.  It could only work if your destination was roughly west of you and you had a very fast aeroplane. Then for the Sun’s azimuth to remain constant, speed x cos(track-270°) would have to equal 15’longitude/minute of time.   E.g. flying west at 60°N you would need 15cos60° nm/minute= 7.5nm/min or 450kts groundspeed.  The Vulcan cruised west at M0.84 FL430 = 480kts TAS most days. Crossing the Atlantic E to W, we would occasionally find we had precalculated the same Hc and azimuth for two or three Sun lines in a row.    DaveP

    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