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: True North and Precession
    From: Sean C
    Date: 2021 Feb 18, 16:12 -0800

    Jim,

    You wrote:

    "I got the confused notion that somehow the actual north pole, the actual physical spot around which the northern hemisphere turns, actually moved.  I must have imagined the wandering of the magnetic pole.  In any case... I was an accountant by trade, so what can you expect? On thinking it over, I believe the poles don't physically wander around but the axis wobbles, pointing at different points in the sky over very long time periods... right?"

    Except the poles do wander. Although not by a large distance. See this article on polar motion at the IERS website:

    https://www.iers.org/IERS/EN/Science/EarthRotation/PolarMotion.html

    I have also attached a plot I made several years ago of the polar motion from 2000 to 2015. I'm prety sure I got the distances right, but I might not have.

    Cheers,

    Sean C.

    File:


       
    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