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Published byMolly Parks Modified about 1 year ago

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Sun Angles Impact the amount of Insolation Daylight Hours Seasonal Seasonal October – March October – March Low – SunLow – Sun April – September April – September High - SunHigh - Sun Solar declination Latitude where sun is directly overhead (90°) Sub Solar Point Zenith Angle Angle between 90° and sun at noon Sun Angle Angle of the sun above the horizon at noon

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Sun Angles Zenith Angle + Sun Angle = 90° SO What is Tuscaloosa’s noon sun angle on June 21 st ? What is Tuscaloosa’s noon sun angle on June 21 st ? Let’s practice 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

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The Analemma

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Daylight Hours How does sun angle impact the amount of daylight hours at different latitudes? Online calculator

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Solar Intensity Intensity = Sin (A) Sin = sine Sin = sine A = sun angle A = sun angle 90 = 100% efficiency 80 = 98% 45 = 71% 20 = 34%

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Run Applet

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Insolation by Latitude

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NET RADIATION

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