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: A Cook-esque Lagoon lunar
    From: Antoine Couëtte
    Date: 2010 Apr 19, 08:17 -0700

    Dear Jeremy and Dear Peter,

    In reply to your post Jeremy [# 12782], with Peter's solution given in NavList [# 12795], I finally had time to work your example out :


    The 120ft Tower is seen under an angle of 26'9 (cfse : corrected for sextant error). Therefore its distance should be quite close from 15809', or 4817 m or 2.6 NM.

    From this distance and your height of eye 106' get a dip short Moon correction of -24.1'

    We can then process your Lunar with the following values :

    Date Apr 05, 2010, approximate position S0700.0E07200.0

    Average value of the Distances between Sun and Moon : 104°02'075 (cfse), and

    Sun heights average value : 37°22'4 LL (cfse), and

    Moon heights average value : 37°03'75 (cfse and corrected for dip short)


    From these values, and with TT-UT=66.8 s, get the following :

    UT 03h48m18.8s / S 05°28'8 / E 072°15'7 / Lunar derived


    ... Well, given that your anchorage position should be close from S07°16'7 / E 072°25'7, this is far from being a quite exciting result (although the longitude determination is fair enough). Therefore, I published all intermediate values and relevant assumptions so that anybody else can check for any possible error or misunderstanding from my part.


    Now it's Paul's turn ...

    Go for it Paul !!

    Best Regards to you all


    Kermit


    PS : One Last note / Jeremy, I AM interested in computing some of your Venus-Moon Lunar examples ...

    Thanks again for all these Great Lunar examples you are offering us.

    *********
    [NavList 12795]
    1) 2.6 nm
    2) 24.1'
    3) 3:48:08
    4) S 6 deg 07.7' (-6.128)
    E 72 deg 26.8' (72.447)

    Please see the attached Google Earth screenshot. The longitude looks OK for Diego Garcia but the latitude came out too far north…


    Peter Hakel

    ************


    From: "Anabasis75---com" <Anabasis75---com>
    To: NavList@fer3.com
    Sent: Wed, April 7, 2010 7:43:41 AM
    Subject: [NavList 12782] A Cook-esque Lagoon lunar

    In celebration of the recent thread about the 155 degree lunar in the South Pacific, I offer this lunar observation.
    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com
    ----------------------------------------------------------------

       
    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