Solar Standard Test Conditions Question
Need help understanding this or else it is just wrong, am very confused, any help appreciated--- "By convention, solar cell efficiencies are measured under standard test conditions (STC) unless sta...
Forum Discussion
Not sure about the 37 degrees, but note 2 in the Wiki article references an ASTM that talks about that. The 41.81° I believe comes from the calculation of Air Mass of 1.5. Air mass of 1 indicates the sun is directly overhead. The calculation for AM is 1/cos of angle of sun from vertical. So 1/cos 48.19° = 1.5. 90-48.19 = 41.81° latitude at solar noon on solstice.
