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: Basics of computing sunrise/sunset
    From: James N Wilson
    Date: 2009 Jun 19, 19:46 -0700

    I'm not with you yet. At totality, only the corona is visible, and so the
    light received is significantly reduced. It's easy to look at that with
    the naked eye or with binoculars. The difference between the last
    millisecond of partiality and totality is gigantic. Just a sliver of the
    sun is too bright, but when only the corona is visible, it's quite easy
    to look at.
    Our next eclipse will be next month near Iwo Jima, and will be over six
    minutes in duration--the longest of the century. What that means is that
    the moon is much closer, and so it will blank out more of the sun. I
    think that means that we will see less corona.
    And I have to correct myself about seeing sunspots during totality. Only
    the corona is visible, along with solar flares.
    As far as seeing Baily's beads and the "diamond ring," they are such
    fleeting images that you have to be totally attentive to see them. And
    the brightness increase immediately afterwards is blinding enough that
    you naturally look away. The diamond ring is the first thing seen at
    totality, the sun finding a gap in the lunar surface to shine through.
    Again, it is of very short duration, so I don't think there is any danger
    Aren't our reflexes adequate safeguards? When the sun is too bright, it
    seems like I automatically look away.
    Jim Wilson
    Criminal Lawyers - Click here.
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com

    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