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: Henning Umland's javascript web app
    From: Brad Morris
    Date: 2018 Apr 10, 16:13 -0400

    Have you considered Alex's apps?
    Have you considered Frank's apps?
    How about Stan's?
    Of course, there are others...my apologies if I didn't remember or mention various authors.

    There are several you can chose from, by folks who correspond right here.  Each may have their own drawbacks and benefits, but it will be up to you to find the one you like.

    There are also bunches of hand Calc methods that we have investigated.

    I don't know that anyone can tell you which one to use, since this is a preference question in the end


    On Apr 10, 2018 10:47 AM, "Bill Lionheart" <NoReply_Lionheart@fer3.com> wrote:

    Sorry for my confusion. The subject heading and the message said
    spreadsheets. What I meant was HTML forms with Javascript
    calculations. There are spreadsheets around too of course with
    different authors, but typically they dont use javascript for the
    On 8 April 2018 at 21:03, Bill Lionheart  wrote:
    > Next month I am sailing from St Lucia to Bermuda and then to NY on a
    > friend's yacht (lucky me!) . I said I would  show the crew some simple
    > celestial navigation, and it is a grat chance for me t practice
    > sextant work myself with I hope clearer sky than I am used to!
    > I currently use my own rather eccentric python scripts using the ephem
    > library but I wanted to show them sight reduction on spreadsheet so I
    > went back to Henning Umland's excellent spreadsheet
    > "Sun and Moon Almanac  V1.51  for the Years 1975-2015"
    > It seems the version I have has a hard coded limit on the year as it
    > does not have this year's delta T, and I think the one on Henning's
    > web site has not been updated. It is an easy matter to edit the
    > javascript to update Delta T, but I may be reinventing the wheel here,
    > perhaps someone has a version working for 2018 already?
    > (we had an earlier discussion of a java script bug, due to a change in
    > the trunc function in java script as I remember, but that was a few
    > years ago).
    > Best wishes
    > Bill Lionheart
    Professor of Applied Mathematics
    University of Manchester

    View and reply to this message

    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