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
    Summer Solstice PV Sun Obs.
    From: Greg Rudzinski
    Date: 2014 Jun 21, 12:21 -0700

    Here is a summer solstice morning prime vertical observation of the Sun using an artificial horizon. The sextant was preset to 90° 10' using 2x arc sin{sin d / sin L . There is about an 8 minute window where the azimuth remains close to 90°.  The actual observation showed the Sun images slightly seperated and diverging from the preset which indicated that the Sun had just passed prime vertical. No need to figure azimuth for this type of observation :)

    The index card shows a Doniol longhand reduction checked by slide rule and phone app.

    Greg Rudzinski

     



    File:



       
    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