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
    Name or NavList Code:
    Email:
       
    Reply
    Re: Anomalous dip. was: [NAV-L] Testing pocket sextant.
    From: Bill B
    Date: 2006 Jun 16, 17:20 -0400

    George
    
    > I've just posted a meassage, in the hope of reducing
    > misunderstandings, in which was the paragraph-... large snip
    
    Thank you George, but I did get your meaning, hot, warm, cool, cold the
    first time;-)
    
    While it has been discussed on a plane too high for me to comprehend in the
    past, your latter explanations were clear and understandable to this
    layperson. Especially once you did away with ambiguous (to me) use of signs.
    You also defined "lapse rate, a missing key for me.
    
    George et al
    
    Now that I have the basic concept, what happens on a larger scale?  We could
    use Frank's beach shots as an example (Indiana to Chicago, approx. 22 nm).
    Assume a thermal inversion as Frank stated.  What will that do to the
    horizon relative to a horizon with well-mixed air (shift it up or down) and
    what will it do to building tops around 1100-1500 feet above water level
    (raise or lower them)?
    
    The problem I was having using the current Bowditch Table 15 formula was
    that the distance kept falling short, meaning if the T15 constants are
    correct, the angle measured was too large.  Therefore if the horizon was
    shifted up, the building tops must have been shifted up to a greater extent.
    
    I understand the problem as stated may be too complex for a simple answer,
    but try a if-then.
    
    I also strongly suspect another problem area is the Bowditch constants.
    
    Thanks
    
    Bill
    
    
    

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.
    Email:

    Email Settings

    NavList ID 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