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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Henning Umland's javascript web app
From: Brad Morris
Date: 2018 Apr 10, 16:13 -0400
From: Brad Morris
Date: 2018 Apr 10, 16:13 -0400
Bill
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
Brad
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 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
