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: Position from altitude and azimuth.
    From: Antoine Couëtte
    Date: 2020 May 11, 02:19 -0700
    Hello to all,
    Parallax ...
     
    Here, I incorrectly corrected Topocentric Height into Geocentric Height by HP0 (0.1453’) instead of HP (0.0835’) .
     
    I then “artificiallly” increased Geocentric Height by such difference (0.0618’ or 3.7" which still remains within the 6" data accuracy specified here).
     
    Fortunately in this example the extra-parallax effects in both Height and Azimuth due to WGS 84 vs. Spherical Earth are under 0.001’ .
     
    Hence my WGS84 sanity check was immediately able to pick up this undue difference : Azimuth is fine, and we just need to decrease the height by 0.061’ .
     
    Best Navigational Regards to all,
     
    Antoine
       
    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