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Sun Angles

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

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Sun Angles

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  1. Impact the amount of Insolation Daylight Hours Seasonal October – March Low – Sun April – September High - 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 Sun Angles

  2. 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 Sun Angles

  3. The Analemma

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

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

  6. Run Applet

  7. Insolation by Latitude

  8. NET RADIATION

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