CHAPTER 21 I PASSIVE DESIGN


earth tilts towards sun in summer


earth tilts 23.5° 36.6° 13.1° 23.5° 53.4°N 36.6° + 23.5° = 60.1° 36.6° 60.1° 53.4°N 53.4°


away from the sun in winter


23.5°


36.6° – 23.5° = 13.1° 





Once the latitude of a site is known (which can be easily found online or by using Google Earth), the maximum sun angle can be calculated using these formulae:


season   ACTIVITIES


Look up the latitude of your home using the Google Earth app. Calculate the maximum sun angle in summer, winter 


summer solstice winter solstice 21.10 Maximum sun angle formulae Worked example


 season


maximum sun angle   summer solstice winter solstice 21.11 Maximum sun angle example.  90˚ – 53.35˚+ 23.5˚= 60.15˚ 90˚ – 53.35˚– 23.5˚= 13.15˚ 90˚ – latitude + 23.5˚ = maximum sun angle 90˚ – latitude – 23.5˚ = minimum sun angle maximum sun angle 





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