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: Summer Solstice
    From: John D. Howard
    Date: 2016 Dec 23, 18:28 -0800

     David, Brad,

    The azimuth is easy Due North !

    If the sun is too high for a LAN the set the mirror for north ( or due south for us winter folk ) and use what is called a sine bar to set the tilt.

    A sine bar is used in machining to set very accurate angles.  A bar has two round prutrusions on the bottom set at an accurate distance appart ( usually 5 inches ) then each round is set upon a stack or block - two different heights - and the angle is known by the sine of the difference of the two heights.

    Using a micrometer the heights can be measured to 1/10000 inch.

    I have not done the math but I don't think a degree or two would make much difference.

    John H.

       
    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