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
    Name or NavList Code:
    Re: Ecliptic coordinates of stars
    From: David Pike
    Date: 2015 Mar 30, 06:00 -0700


    Further to my last post.  I’ve just realised, it’s actually not that hard to work out.  If the declination of Arcturus has reduced by 11 minutes of arc in 35 years, on average, it’s reduced by 18.9 seconds a year, 0.05 seconds a day, or 0.002 seconds an hour.  From the P&N correction table 5 in AP3270 Volume 1, it would appear that the effect of all this upon position line accuracy also depends upon LHA Aries at the time of an observation and the observers latitude.  Dave


    Browse Files

    Drop Files


    What is NavList?

    Get a NavList ID Code

    (please, no nicknames or handles)
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.

    Email Settings

    NavList ID 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