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: Which diameter of the sun in digital photos ?
    From: Marcel Tschudin
    Date: 2009 Aug 21, 22:38 +0300

    Greg, thank you for your suggestions.
    
    For this exercise I'm using always the same camera having always the
    same lenses.The sun's diameter is measured in a photo-program after
    removing all colours except green and in some cases even removing all
    but blue. I fear to put an other hand-held filter in front since I
    have to measure the distance to the horizon which still must be
    visible, since the main purpose is to measure the sun's distance to
    the horizon. I have so many only faintly visible sun pictures
    confirming the obtained scale that I'm fairly confident that the value
    corresponds to what the camera 'sees'.
    
    Have you ever tried with the same lenses to compare the pixels per
    degree you obtained for the sun with those of landscape features?
    
    Marcel
    
    --~--~---------~--~----~------------~-------~--~----~
    NavList message boards: www.fer3.com/arc
    Or post by email to: NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    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