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: Moon corrections: how computation order affects the result
    From: Frank Reed
    Date: 2020 Sep 1, 09:54 -0700

    David Iwancio,

    Great explanation. I couldn't explain it better myself. In fact, I have tried, and I could not explain it better myself! About fifteen years ago, the late, great Stan Klein asked me to explain the calculations underlying the lunar altitude correction tables in the back of the Nautical Almanac. OK. No problem. I showed him two algorithms for it. And he noticed the same thing that Eric Fernandez discovered. I explained to Stan that it was because the augmentation was really a small variation in the parallax and since SD is directly proportional to HP, it all works out the same, but in the end I couldn't compose a "clean" explanation. Yours is excellent. 

    Frank Reed

    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