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: Celesital Navigation Through Clouds
    From: Gary LaPook
    Date: 2009 Dec 18, 11:32 -0800
    Just pitch the nose up, add power and climb to "on top."

    gl

    --- On Thu, 12/17/09, Bruce Hamilton <brucerhamilton---.com> wrote:

    From: Bruce Hamilton <brucerhamilton---.com>
    Subject: [NavList 11235] Celesital Navigation Through Clouds
    To: navlist@fer3.com
    Date: Thursday, December 17, 2009, 10:50 PM

    Living on the West coast, I get to see a good deal of cloud cover and run out when the sky clears to take a few shots. One year we had no visible sky for 28 days in a row.

     Cloud cover has always been the weak spot in celestial navigation, and I can remember talking to the first mate on a big French bulk carrier we were loading coal into, and he said his last trip from Europe to Japan, they only got two or three celestial fixes.  Fortunately his ship had one of the early GPS units, and he was thankful for it. It was the size of a kitchen stove in 1982.

    Anyway, I was wondering if a camera that was more sensitive to more of the spectrum was fixed to a sextant  could it get enough detail to make a shot on a cloudy day, or perhaps even see the stars during the day? I suppose there would be diffraction issues as I know when I am shooting stars through high, thin cloud, my results get more random. I think surveyors used to shoot Polaris during the day.

    I always like to think of how much the sextant could advance as a navigation tool if coupled with more modern technology.. I have seen pictures of sextants that record the time of the shot, and that alone is a big plus.  I know from time to time the list members come up with ideas on sextant improvements, and I was wondering if it would be possible to make the cloud cover a non-issue.

    --
    NavList message boards: www.fer3.com/arc
    Or post by email to: NavList@fer3.com
    To unsubscribe, email NavList+unsubscribe@fer3.com

    --
    NavList message boards: www.fer3.com/arc
    Or post by email to: NavList@fer3.com
    To unsubscribe, email NavList+unsubscribe@fer3.com
       
    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