Welcome to the NavList Message Boards.


A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Add Images & Files
    Re: Problem: index correction by star
    From: Modris Fersters
    Date: 2020 Oct 15, 22:49 -0700

    Thank you very much, Frank. Your proposed first method is ingeniously simple. Yes indeed—I have always eliminated the side error without analysing its effect on measured angle. After reading your answer I tried to imagine how the side error o 1’ affects the measured angle of lunar distance. Probably 2 seconds of arc, I think (see picture bellow)?

    Your second method in my situation would not be practical because my metal sextant (USSR model SNO-M) is good instrument but I have noticed that on account of frequent transportations by car and in different temperatures  it gives slightly different IC values. Therefore I have no posibility to rely on the results of IC measurments which are made only once during a long period of time.

    I would like to take opportunity and say a big thank to you, Frank, for your work.  The almanac, lunar calculator, your GPS Antispoof, managment of NavList etc. — all these things have become so ordinary for me, as a logical part of my hobby.

    Modris Fersters

    Sextant hobbyist from Latvia   

    Browse Files

    Drop Files


    What is NavList?

    Join NavList

    (please, no nicknames or handles)
    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 Settings

    Posting Code:

    Custom Index

    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