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: 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.

    Marcel
       
    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