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: Sun squash- was Green Flash and Longitude
    From: Ken Gebhart
    Date: 2006 Jan 15, 11:42 -0600

    On 1/14/06 9:24 PM, "Fred Hebard"  wrote:
    
    >
    >
    > Great post Ken.  I can imagine it would be a lot of fun, or
    > something, to try to work out a sight by hand while steering with
    > one's knees!
    >
    > How would you measure squash?  The altitude of the two limbs and
    > assuming the SD for the width or the semi-diameter both ways?  I
    > don't know how to do semi-diameter with an aircraft sextant (or
    > anything else with an aircraft sextant!).
    >
    > Fred
    >
    Thanks Fred,
    
    The idea is just a visual observation without a sextant.  The ellipse
    templates as mentioned, could be used to compare with the squashed sun to
    get a good value.  The entire squash phenomenon takes place during a 15 to
    20 minute period.  The first discernable squash is at about 2%, and can best
    be seen with the head tilted 90 deg to the side. For some reason we humans
    can detect a slight ellipse with the major axis vertical rather than
    horizontal.
    
    Ken
    
    
    

       
    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