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 Shots Through Clouds
    From: Bruce J. Pennino
    Date: 2014 Nov 5, 21:01 -0500
    I have not been following this topic too carefully, but something seems incorrect here. When not superimposing the image, I just checked in Sextant Handbook/Bauer, with an AH, the sun LL is brought down to the upper limb, as done normally (double reflection is erect). Divide by two and use normal refraction corrections.
     
    It seems to me if images are superimposed via AH, because the sun correction  tables are set up for LL, there is a semi diameter correction. With superposition,  the half-angle is too large(for using the standard tables) , so subtract 16 minutes (I think) from the tabulated refraction correction.  Did I say/write  this correctly?
     

    Bruce














     
    From: Samuel L
    Sent: Wednesday, November 05, 2014 4:51 PM
    Subject: [NavList] Re: Sun Shots Through Clouds
     

    Below is a photo taken today at GMT 14:59:31 in an effort to try out Worsley's method using an AH. The Sun had no discernible shape except as seen in the photo.

    Hs- 55d 11.0min

    The Sun was superimposed on the AH and an amber colored filter was used to help distinguish between the two images.

    No corrections were applied to the Hs Sun sight except to divide the Hs by two to get 27d 35min. In other words- the sight was very sloppy except to make as certain as possible that the Sun images were superimposed.

    Results-

    Ap Longitude- W075d 58min

    Ap Latitude- N041

    Z= 150d

    Intercept= 24nm.

    The resulting LOP, as happened yesterday, passed directly through my GPS determined location.

    Sam L.

     



    Attached File:

    (IMG_9767.JPG: Open and save)

    View and reply to this message

       
    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