Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Instumental error?
    From: Fred Hebard
    Date: 2005 Apr 20, 14:12 -0400

    On Apr 20, 2005, at 12:21 PM, Alexandre Eremenko wrote:
    >>> I know a very clever method of calibrating your sextant
    >>> "at home" that is without stars, but you need a theodolite
    >>> or another instrument more precise than the sextant,
    >>> and with precise level.
    >>> Can describe the method to the list if anyone is interested.
    >>> (I recently read about it in one XIX century paper on
    >>> the Internet).
    >> Please do publish.
    >> Bill
    > The article is available on:
    > http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=
    > 1865MNRAS..25...56T&db_key=AST
    > but I am not sure whether it's free or Purdue pays for
    > subscription.
    > But I am afraid that my conclusion that it is a clever method
    > was somewhat premature:-)
    > Trying to describe it with my own words I found that it is
    > hardly practiceable with the sort of ordinary theodolites
    > I've ever seen:-) A theodolite with hudge objective lens
    > is needed...
    > Alex.
    I was able to read the article, so it must be accessible to everybody.
    The "bibcode" is on the second line of your link as I received it.  The
    carriage return needs to be removed from the middle of the link.
    I believe Chauvenet mentions calibration with a theodolite, or else the
    Hydrography text (which is home while I'm at work).
    I couldn't find mention in this work of the need for a theodolite with
    huge objective lens.  Is that in the original work by Sims?

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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