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
    Re: Intercept Method In Usa ?
    From: Henry Halboth
    Date: 2015 Sep 14, 00:14 -0400

    Jacques,

    Although used prior thereto, the intercept method became really popular in the USA during WWI and immediately thereafter with the introduction of a number of short tabular methods. Amongs the tabular methods then introduced were “Simultaneous Altitudes & Azimuths of Celestial Bodies”(HO 201), “Sumner Line of Position of Celestial Bodies” (HO 203 & 204), and “Altitude & AzimuthTables” by Radler de Aquino of the Brazilian Navy (published as HO 200) – all of which can beownloaded from the internet for free.

    Please note that HO 203 & 204 were also basically intercept methods in that based on entry with whole degrees of assumed Latitude and Altitude, plus an interpolation for Decination only, a Longitude & Azimuth are obtained – thereafter a LOP is plotted at right angles to the Azimuth at a distance equal to the difference between th\e observed and assumed altitudes from the position described by the assumed Latitude and the calculated Longitude, away or towards as the case may be.

    Henry




     Sep 13, 2015 at 10:17 AM, Ducruy Jacques <NoReply_Jacques@fer3.com> wrote:

    Hello,

    I would like to get an information about the use of "intercept method" (or St Hilaire method) in USA.

    It seems to me that this method had been used in France before 1900 (it is logical, because St Hilaire was french !). But when this method is become usual in USA ?

    The reason of my question is the fact that the HO 203 tables was published in 1923, and these tables was use only for the calculation of hour angle and azimuth ... for Sumner's method ! But I know that tables as HO 208 or HO 211  was already used for intercept method.

    Thank you in advance.

    Best Regards

    Jacques


       
    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