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Sun Angles Impact the amount of Insolation Daylight Hours Seasonal October – March Zenith Angle April – September • High - Sun Latitude where sun is directly overhead (90°) • Sub Solar Point • Low – Sun Solar declination Angle between 90° and sun at noon Sun Angle Angle of the sun above the horizon at noon Sun Angles Zenith Angle + Sun Angle = 90° SO What is Tuscaloosa’s noon sun angle on June 21st? Let’s practice Step 1 Determine declination of sun for that date Step 2 Find noon sun angle • Difference in ° between location’s latitude and SS point then subtract from 90 The Analemma Daylight Hours How does sun angle impact the amount of daylight hours at different latitudes? Online calculator Solar Intensity Intensity = Sin (A) Sin = sine A = sun angle 90 = 100% efficiency 80 = 98% 45 = 71% 20 = 34% Run Applet Insolation by Latitude NET RADIATION