azimuth angle
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CG: n

CT: The azimuth angle is the compass direction from which the sunlight is coming. At solar noon, the sun is always directly south in the northern hemisphere and directly north in the southern hemisphere. The azimuth angle varies throughout the day as shown in the animation below.

S: PVedu – http://www.pveducation.org/pvcdrom/properties-of-sunlight/azimuth-angle (last access: 11 July 2014)

N: 1. azimuth (n.) “distance of a star from the north or south point of the meridian,” late 14c., from Old French azimut, from Arabic as-sumut “the ways,” plural of as-samt “the way, direction” (see zenith).
2. The azimuth angle is the compass direction from which the sunlight is coming. At solar noon, the sun is always directly south in the northern hemisphere and directly north in the southern hemisphere.

S: 1. OED – http://www.etymonline.com/index.php?allowed_in_frame=0&search=azimuth&searchmode=none (last access: 15 September 201). 2. http://pveducation.org/pvcdrom/properties-of-sunlight/azimuth-angle (last access: 21 September 2014).

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CR: solar thermal energy