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: Can I Navigate Without an Assumed Position?
    From: Robin Jouan
    Date: 2017 Sep 24, 02:58 -0700

    Hello Ron and Antoine,

    My first answer was using GHA and Dec as given by Ron. And the result was on the target (as Peter Hakel did it).

    If I use integrated ephemerids of ASTROLAB to compute GHA and Dec of Deneb, Pollux, Spica, I obtain through ASTROLAB total automation:

    48° 7.8' N  & 123° 27.7' W, which is 1.28 NM in 242° from my first result. DOP is obviously similar, but standard deviation is near 2 NM.

    Adding Arcturus (4 body problem) slightly changes this location into 48° 7.7' N  & 123° 25,7' W, with reduced standard deviation.

    I will comment these figures, if needed.

    BR, Yves

    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