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: Sextant calibration by observations
    From: Modris Fersters
    Date: 2023 Jan 21, 01:42 -0800

    Hello, Alex!

    You wrote: “I am very impressed with the work you have done. How much time did this take?”

    In the grahp I have posted, I ploted the results from observations taken during period of about 2,5 years. It would be very hard and tiring to calculate and plot the results after several years. Therefore I had another strategy. I ploted the results in the same day I made observations.

    I put in Excel measured angles and calculated angles, index correction, filter correction and Excel calculated for me final average value of arc correction. I even wrote a very long formula in one cell of Excell to automaticaly calulate micrometer error according my micrometer correction graph.

    And then I ploted final correction value in graph. It takes about 10 minutes to do all the steps (it depends how many observations are to be documented).

    To get calculated values of angles I used :

    1) for lunars — Frank’s online lunar calculator;

    2) for Sun sigts with AH—Frank’s Antispoof app;

    3) for star/star distances — P.Hirose’s Lunar4.4

    Modris Fersters

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    NavList is a community devoted to the preservation and practice of celestial navigation and other methods of traditional position-finding. We're a group of navigators, navigation enthusiasts and hobbyists, mathematicians and physicists, and historians interested in all aspects of navigation but primarily those techniques which are non-electronic.

    To post a message, if you are already signed up as a NavList member, start a new discussion or reply to any posted message and use your posting code (this is a simple low-security password assigned when you join). You may also join by posting. Your first on-topic messsage automatically makes you a member, and a posting code will be assigned and emailed to you for future posts.

    Uniquely, the NavList message boards also permit full interaction entirely by email. You can optionally receive individual posts or daily digests by email, and any member can post messages by email (bypassing the web site) by sending to our posting address which is "NavList@NavList.net". This functionality is similar to a traditional Internet mailing list: post by email, read by email, reply by email. Most members will prefer the web interface here for posting and replying to messages.

    NavList is more than an online community... more about that another day.

    © Copyright notice: please note that the rights to all messages and posts in this discussion group are held by their respective authors. No messages or text or images extracted from messages may be reproduced without the explicit consent of the message author. Email me, Frank Reed, if you have any questions.

    Join / Get 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