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: A ramble on "new improved methods"
    From: David C
    Date: 2020 Jun 30, 15:25 -0700

    Frank wrote

    sin(Alt) = sin(Lat) sin(Dec) + cos(Lat) cos(Dec) cos(HA).

    Or turn it around:
       cos(HA) = [sin(Alt) - sin(Lat) sin(Dec)] / [cos(Lat) cos(Dec)].

    Thanks. That is so easy! I have stated before that my maths is very, very rusty. I should have been able to work that out myself.

    I have ordered a copy of Burtons tables online. It will be interesting to see how long it takes to get here.

    I have googled Burton but there is not much information about him.  One piece of information suggests that he was a younster, being born in 1899. Does any one have information about him? I have searched the forum archives but found only two messages both of  which were in the form of (unanswered) questions.

    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