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    Re: Henning Umland's javascript web app
    From: Bill Lionheart
    Date: 2018 Apr 10, 15:06 +0100

    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
    calculation!
    
    Bill
    
    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
    http://www.maths.manchester.ac.uk/bl
    

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