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: Extremely poor conditions??
    From: Alexandre Eremenko
    Date: 2012 Mar 20, 09:53 -0400

    John,
    
    > I've heard of a report of some very impressive looming over Lake Michigan
    > in the spring.   I recall that people in a town in Michigan could see the
    > lights of Milwaukee one night - 80 miles away and well over the geographic
    > horizon.
    
    But this is "normal refraction", I mean very large, but "in the normal
    direction": The light ray is curved in the same direction as the
    Earth surface. This sort of refraction would require NEGATIVE
    correction to compensate it. In our case, the refraction had to be
    in the opposite direction: the ray had to be curved on the opposite
    direction to the Earth surface.
    
    This means that the remote toll bioldings whose tops are normally visible
    would be unvisible in these conditions.
    
    Alex.
    
    
    
    
    

       
    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