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: Refraction
    From: Fred Hebard
    Date: 2005 Aug 13, 10:37 -0400

    Marcel,
    
    I expect that H.O. 249 is put out by the naval observatory.  Try going
    to http://aa.usno.navy.mil/ going to the "About AA" page and the
    "contact us" page.  You also might poke around at
    http://www.nao.rl.ac.uk/.
    
    Also, I don't believe relative humidity has much influence on
    atmospheric refraction.  As George H. pointed out, it's a direct
    function of density, which is primarily controlled by air temp and
    pressure.
    
    Fred
    
    On Aug 13, 2005, at 10:00 AM, Marcel E. Tschudin wrote:
    
    > While you were afloat, I transferred the data of table 6 (only the
    > range 0ft
    > to 35'000ft) into an Excel sheet. I actually also tried to get in
    > contact
    > with the authors of this table, unfortunately all efforts failed so
    > far.
    > Pub. No. 249 is originally from NIMA. It seems that after the
    > reorganisation - NIMA either became or was merged with NGA - no one
    > seems to
    > know whom to contact, or indicating wrong e-mail addresses.
    
    
    

       
    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