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: Appeal to forum members to collect data
    From: Robert Eno
    Date: 2007 Oct 25, 18:14 -0400

    
    ----- Original Message -----
    From: "Jim" 
    To: "NavList" 
    Sent: Thursday, October 25, 2007 1:52 PM
    Subject: [NavList 3586] Appeal to forum members to collect data
    
    
    >
    > I would like to collect some data from a variety of observers using a
    > variety of marine sextants taken in a uniform manner.
    >
    > What I am proposing is to collect data using the following method:
    >
    > 1. Take 5 observations (moon and sun, star or planet) standing on
    > land. No graphing, just 5 raw observations.
    >
    >
    > 2. Record name of observer, sextant used, power of sextant scope, GMT,
    > date, Lat and Long, name of body used, distance (corrected with IE),
    > barometric pressure, temperature, error in each observation (in
    > minutes)
    >
    >
    > 3. I would propose using Frank's online calculator to evaluate the
    > error in each observation using the known lat and long and letting it
    > calculate the heights of the moon and body observed.
    >
    >
    > 4. Angular measurements reported in whole degrees and minutes rounded
    > to the nearest 0.1'.
    >
    >
    > 5. Make the observations in good conditions and with the moon and body
    > 15 degrees or more above the horizon.
    >
    >
    > 6. Submit the results to me and I will accumulate the data in tabular
    > form. I could provide an Excel template to use or the results could be
    > sent in a set text format.
    >
    > My ambition in doing this would be to have some clear cut answers to
    > the accuracy and precision questions that come up. What I have found
    > is that although there have been many postings on the topic, there is
    > always some question as to how the observation(s) were taken, the
    > method of evaluation used or what almanac data was used.
    >
    > Once in electronic format we could proceed to analyze the data in a
    > multitude of ways.
    >
    > I would invite comments on this proposal at this point and will remain
    > hopeful that a few people out there would like to join the endeavour.
    >
    > Jim
    >
    >
    > >
    >
    
    
    --~--~---------~--~----~------------~-------~--~----~
    To post to this group, send email to NavList@fer3.com
    To unsubscribe, send email to 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