Developing formula for Hours of Sunshine

The formula we come up with is going to be very much different from what official standards will develop. Most of us are programmers, not weather scientists or meteorologists. Anything we develop will be very unofficial.

You should continue to advocate for WeatherFlow to use an acceptable formula. They have the knowledge and research tools we dont.

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it turns out that even the official formulas/instruments are being adjusted with fudge factors to match the historic cambell-stokes measurements. So even they are kind of messing around. The best definition sofar is ā€˜hours you can actually see the sun itselfā€™ (no clouds blocking it), but that isnā€™t what the cambell-stokes is measuring, and the instrument is inaccurate anyway as it depends for example on humidity. So it is fine if we come up with practical solutions that are not so official.

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Yep max solarad for long/lat *.8 if staion measures this valule the sun is shinghing and sum the time :+1:

Unfortunately, my uv, brightness, and radiance measurements are a factor 2 too high
uv 10.4, 77594 lux, 646 W/m2
where as some other nearby weatherflow stations read:
uv 4.2, 53025 lux, 441 W/m2
uv 4.2, 57554 lux, 482 W/m2
( just submitted a support request)

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Actually Iā€™ve the same but thatā€™s another thread , let us know what the outcome is.