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
    Name or NavList Code:
    Email:
       
    Reply
    AH: windproof shades material
    From: Igor S.
    Date: 2021 Mar 17, 09:38 -0700
    In the book Basics of Nautical Astronomy by N. N. Matusevich (1956) has mentioned the recommended material for the shades of artificial horizon, namely Mica (see for details: https://en.wikipedia.org/wiki/Mica). Due to its crystal structure it won't deflect sun rays contrary to normal glass.
    Has someone compared sun sights with and without using shades? Is there any difference ?

    Are the two pieces of normal float glass  2 - 4mm at an angle of 90 degree enough to get accurate results at any sun altitude?

    kind regards,
    Igor
    File:


       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Get a NavList ID Code

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    A NavList ID Code guarantees your identity in NavList posts and allows faster posting of messages.

    Retrieve a NavList ID Code

    Enter the email address associated with your NavList messages. Your NavList code will be emailed to you immediately.
    Email:

    Email Settings

    NavList ID 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