Comments on Solar Radiation Outside the Earth's Atmosphere

Comments

I have a little doubt about the irradiation ,which seems to be lack of diffuse radiation?

I don't know but why "An equation [1] which describes the variation throughout the year just outside the earth's atmosphere" was have not same result calculation with "Day of the Year - Sunlight Intensity Calculator".
The plot results from that term like a wave.

if it travels an ellipse in a year, wouldn't there be two minima and maxima. probably july should be a max and the mins are missing?