1- How can I calculate the sunlight intensity in percentage? (without external influences such as clouds or pollution).
In this site SunCalc, Solar constant changes from location to site or from time to time throughout the day,Why does this happen and does it need to be calculated every time to calculate solar irradiance?
2- How can I calculate sunlight temperature in Kelvins?
And what are the constant values throughout the day for (sunrise, sunset, golden hour and noon)? And is it related to the sun's altitude or time?
3- At what degree of the sun's altitude does it's lens flare appear?