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: Alhena Lunar exercise
    From: Antoine Cou�tte
    Date: 2009 Sep 20, 13:50 -0700

    Sep, 20 2009
    For a better understanding of the lines hereunder, refer to NAVLIST 9816
    Dear Jeremy,
    This one will the very last one for to-day.
    I have used your average values both for UT = 07h43m27.8s and for Sextant 
    Height corrected for Index error = 45�13'4
    Assuming that the listed position N1535.5W04914.6 is valid for 07h43m27.8s, 
    then observed sextant altitudes (corrected for sextant error) at this same 
    time are 48�28'019 for Alhena and 80�45'412 for Moon Lower Limb.
    (1) Computing the Lunar with the forced following values : 07h43m27.8s/45�13'4 
    gives us a sextant distance corrected for ALL effects equal to 45�13'219. 
    Compared to your mean value of 45�13'3, your observation error is 0'18  : 
    EXCELLENT !!!!
    (2) On the other hand, if we assume that both Position and Distance have no 
    error, then UT error would be 00m35.2s with a UT of Sextant Distance equal to 
    7h42m52s6, at which time the geocentric Centers distance would be 45�26'097.
    (3a) If we assume that both Distances and Heights are correct, then UT error 
    is 00m19.4s . Then in such case, UT of Sextant Distance is 07h43m08.4s, 
    Geocentric Centers distance is 45�25'953, and observed position would be 
    Good Night !!!
    Antoine M. "Kermit" Couette
    PS : Hopefully no typos ... I am starting to get tired !
    NavList message boards: www.fer3.com/arc
    Or post by email to: NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com

    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