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: Possibly a dumb question,bear with me please
    From: Bill B
    Date: 2014 May 12, 02:01 -0400

    On 5/12/2014 12:11 AM, Alan S wrote:
    We've been down this path before. Whatever frame of
    reference/model/fiction you choose to embrace, a 15d change in Sun
    GHA/LHA (corrected for v in the NA) does *not* equate to a 15d change in
    azimuth--except in rare special cases.
    More so for the moon. 4 hours do not equate to a 60d change in azimuth,
    nor LOP's at right angles to the "towards" or "away" azimuths.
    Bill B
    > The sun's movements, I know it's the earth that moves about the
    > sun,however the fiction is that the sun moves 15 Degrees/hour, so the
    > angle between LOP's shot 4 hours apart would be 60 D.
    > My understanding of the moon's movements, possibly incorrect, are that
    > it moves more quickly, and in an irregular manner compared to the sun.
    > Given that situation, would AH moon shots taken about 4 hours apart,
    > give LOP's 60D apart, a reasonable cut, providing an acceptable fix, as
    > would be the case with shots of the sun, 4 hours apart. I hope this
    > restatement is clear enough.

    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