Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Position-Finding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
    Lunar-Distance correction for Oblateness
    From: Ed Popko
    Date: 2018 Apr 6, 07:12 -0700

    John Luykx, a frequent contributor to The Navigator's Newsletter (no longer in print), wrote a three-part series on Determining Longitude by Lunar Distance Observation. In this well-written series, he provides sample clearing solutions and computation of longitude from the same lunar observation using DeLambre's and Jean Borda's methods. Attached is this part-three article.[1]

    This is a nice set of examples and the first time I had seen a correction factor for the Moon's Oblateness when correcting the moon's apparent to observed altitude (see page 14, step 21)

    For this lunar observation, the correction is not much and not likely to make any difference to the cleared distant result but since I'm noticing this for the first time, do any other NavList lunarians use this altitude correction?

    Ed Popko



     



    [1] John M. Luykx, "Determining Longitude by Lunar Distance Observation: A Sample Solution", History of Navigation, The Navigator’s Newsletter-Foundation for the Promotion of the Art of Navigation, Issue Fifty-Six, Summer 1997, pp.14-17

    File:


    File:


    File:


    File:


    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