NavList:

   

Reply

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

   

Reply