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: Snellius Construction questions
    From: Herbert Prinz
    Date: 2009 Jan 06, 10:12 -0500

    George Huxtable wrote:
    
    >If the name Willebrord Snellius has a familiar ring, that's because it's the
    >Latinised version of the name of the discoverer of "Snell's Law", governing
    >the refraction of light across a boundary between two media.
    >
    >The construction that Todd refers to was being taught as a standard method
    >in evening-classes in coastal navigation in the UK, all of 50 years ago,
    >though never attributed to Snell.
    >
    
    It's a classical surveying technique, in German called
    "rueckwaerts-einschneiden". The English  name is  "recession for two
    points" (I wish you good luck googling this phrase - particularly in
    times like our's.)  Apparently Snellius was the first to treat the
    problem, but it's often known under the names of other mathematicians
    (e.g. Pothenot, Hansen) who found their own solutions.
    
    As regards the claim on the earlier mentioned website that Snellius
    invented the loxodrome: He only coined the name. The concept was
    introduced by Nunez.
    
    Herbert Prinz
    
    
    
    --~--~---------~--~----~------------~-------~--~----~
    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