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[Csaba Tizedes]

(03-02-2020 07:11 PM)Dave Britten Wrote:  

(03-02-2020 06:42 PM)Csaba Tizedes Wrote:  A very accurate Sunrise/Noon/Sunset program - you can see a little analemma curve installed inside the hard cover for calculating anywhere, anytime, eg. during a hiking:

Youtube video

Are the program listing and analemma curve available somewhere?

Must to find the dwg (AutoCAD) for the curve and the Excel file also - tomorrow I can upload it; the program itself - frankly speaking - not a big deal, the well known method programmed and the accuracy is depends on the declination and equation of time readings - but better than my old CASIO watch. I have checked some days during the year, the accuracy better than 1-2 mins, which is good enough for hiking (of course the new smart watches or SUUNTOs and few CASIO watches can calculate it precisely).

For the fx-50FH possible to calculate DEC and EOT values in the program because the memory is enough.

I used this program with a solver on 50FH to find the altitude of Sun below the horizon to find out what is the max duration after sunset when I can see naked-eye during hiking. I made this experiment from winter to summer and I found that this is (-8.0+/-1.3)° for me at 90% probability. I will check it regularly, maybe I can measure, how it is change by my age.

More important result of these calculations this formula:
Day of the 365 day year: DOY=0.9977×(DAY+30.49×(MONTH-1.026)), this formula's inaccuracy is approx 2 days during the year, but short and 2 days is not a big difference if you want to make these sunrise/sunset calculations.

Csaba