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: Mid XIX century Nav
    From: Alexandre Eremenko
    Date: 2005 Nov 15, 12:35 -0500

    Henry,
    I suppose the coordinates of the rock were not known.
    (Japanese did not practice Cel Nav (or any Nav whatsoever)
    at that time: even construction of the ocean-going ships
    was forbidden.
    But I agree with the previously given explanations that
    the rock was needed to instal instruments like
    theodolite, meridian circle or a sextant on a tripod.
    Or maybe a telescope for Jupiter satellites: this
    Russian ship was very well equipped).
    
    Another suggestion, on pendulum clock, I don't understand:
    what was a pendulum clock for if they had chronometers?
    And how can you check your chronometers using a pendulum clock,
    after a year of ocean voyage.
    
    Alex.
    
    
    On Tue, 15 Nov 2005, Henry C. Halboth wrote:
    
    > Alex, much depends on whether or not the Longitude of the "rock" was
    > accurately known. Pending confirmation of such knowledge their purpose
    > must remain in the realm of supposition.
    >
    > Henry
    >
    > On Mon, 14 Nov 2005 19:36:31 -0500 Alexandre E Eremenko
    >  writes:
    > > I am reading a book by a famous Russian XiX century
    > > author, Goncharov, on his voyage to Japan in 1853/4.
    > >
    > > (The Russians were trying to "open" Japan for trade
    > > at that time, the same thing did the Americans (at exactly the same
    > > time).
    > > Japan was "closed to foreigners"; no one could land
    > > etc. I don't want to describe all details.
    > > Anyway, the Russians were negotiating with the Japanese
    > > authorities for a permission to land. The following episode
    > > in this long and complicated negotiation, which lasted several
    > > months, attracted my attention. The Russians asked for a
    > > permission to land on some rock between their ship place
    > > and the land. Apparently a small uninhabited island.
    > > The reason they clamed for this permission was the
    > > "Necessity to check chronometers".
    > > Apparently they thought that this was a good reason
    > > for landing on a rock).
    > >
    > > Unfortunately the author of the book was not interested
    > > in navigation and did not want to explain to the readers
    > > this point. WHY did the Russians think that this was a
    > > legitimate reason?
    > >
    > > Why exactly did they need land to check their chronometers?
    > > Or, more precisely, why did they think that "checking chronometers"
    > > is a legitimate reason for a landing?
    > >
    > > What was the proper procedure of "checking chronometers" they had in
    > > mind?
    > > Was this by the Lunars?
    > > Did they mean that a firm ground
    > > is needed for the Lunars? Or Jupiter satellites? to install a
    > > powerful
    > > telescope?
    > >
    > > (They were at ancor in the Nagasaki harbor at that time. Nagasaki
    > > was one of the few cities where foreigners were permitted to stay on
    > > ancor
    > > at that time). To finish this part of the story I just say that they
    > > were
    > > not permitted. The Japanese quickly built some structure on the
    > > rock,
    > > as an evidence that this rock was "land", rather than some "rock in
    > > the
    > > sea"
    > > or "uninhabited (and unclaimed?) island" where anyone can land.
    > > Before
    > > arriving
    > > to Nagasaki, the Russians signed the paper that they will not land
    > > without
    > > the permission of the authorities.)
    > >
    > > But I only wanted to discuss the CelNav part of the story.
    > > Why did the Russians think that "checking chronometers" was a
    > > legitimate
    > > purpose of landing on a rock?
    > >
    > > Alex.
    > >
    > > P.S. I am well aware that the first underwater transoceanic cable
    > > layings
    > > were made at about the same time. So the Lunars were doomed, already
    > > then,
    > > even as a
    > > mean
    > > of checking chronometers:-(
    > >
    >
    
    
    

       
    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