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: An exotic lunar distance puzzle
    From: Marcel Tschudin
    Date: 2011 May 4, 01:20 +0300
    "There is no opposite sign."

    I should have added before because the light ray is in both cases the same. The light ray has the same direction of bending as the earth's surface but with a larger radius. An opposite sign for refraction of the horizon as seen from the space shuttle would mean that the bending of the ray curvature would be opposite to that of the earth's surface. It would further mean that the space shuttle would see the observer at the horizon through different air layers than the observer standing at the horizon would see the space shuttle. If one ray would be obstructed by a cloud and the other ray not would further mean that one observer could see the other but the other one not. That is contrary to our experience.

    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