Top of the line

03022020, 08:43 PM
Post: #16




RE: Top of the line
(03022020 07:11 PM)Dave Britten Wrote:(03022020 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: 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 12 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 fx50FH 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 nakedeye 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×(MONTH1.026)), 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 

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