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If the sun is in the sky above a solar panel at azimouth Z1 (0 to 2pi radians) and altitude A1 (-pi/2 to pi/2 radians), and the panel is tilted by altidude A2 (0 to pi/2) and the tilt is facing direction Z2 (0 to 2pi radians), then how can you work out incident light as a protion of light if it was directly facing the sun?
I know that relative to the plane of the panel the altitude of the sun will be A1+A2, so the incidence light will be sin(A1+A2) portion of direct light when A1>0 and zero A2<0. But I am not sure how to now account for the azimouth difference?
At first I thought I simply take the angle between the azimouths and if its in the range -pi/2 to pi/2 it will be visible but this isn't true. The sun could be behind the panel and still shine on it if its high enough.--Dacium (talk) 23:27, 12 October 2011 (UTC)