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: Artificial horizon question
    From: Gary LaPook
    Date: 2009 Apr 20, 03:44 +0200

    Mercury has traditionally been used for an artificial horizon (see Lewis
    & Clark) and it is easy to shoot stars using Mercury. It is rather hard
    to come by these days and is not cheap and some worry about its safety
    (I'm not one of them if used with care.)
    
    The second part of your question, compute in advance the approximate
    altitude of the star, double it and set your sextant to this value and
    then look for the star in the reflecting pool. The navigational stars
    are well separated and are bright so there should be no trouble in
    getting the right star.
    
    gl
    
    P H wrote:
    > Dear NavList Members,
    >
    > Since the nearest ocean is hundreds of miles away from where I live, I
    > must use an artificial horizon in order to work with my sextant.  A
    > pan filled with water works fine enough for me for observations of the
    > moon at night and the sun.  Now these days both the sun and the moon
    > are simultaneously visible during the day, which would allow for a fix
    > on one's position - if the altitudes of both bodies can be measured.
    > As you probably can guess, with all the glare I was unable to observe
    > the reflection of the moon... so here is my question: are there any
    > tricks that would allow one to construct a usable artificial horizon
    > for the daytime observation of the moon?  And to take it one notch
    > further, how about an artificial horizon for the stars and planets (at
    > night, of course)?  Are there any systematic methods to ensure that
    > the star reflected on the surface is indeed the one I intend to observe?
    >
    > Many thanks.
    >
    >
    > Peter Hakel
    >
    >
    >
    > >
    
    
    --~--~---------~--~----~------------~-------~--~----~
    Navigation List archive: www.fer3.com/arc
    To post, email NavList@fer3.com
    To unsubscribe, email NavList-unsubscribe@fer3.com
    -~----------~----~----~----~------~----~------~--~---
    
    

       
    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