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http://www.desertusa.com/mzm/montzom.jpg http://www.utahadventure.com/molinet/3cliffpalace.jpg http://www.wwcc.cc.wy.us/wyo_hist/images/web.cliff.dwelling.jpg

http://www.photo.net/photo/pcd0087/taos-pueblo-with-mtns-47.4.jpg http://candywitcher.tripod.com/Taos-Pueblo-VIII.jpg

http://www.eere.energy.gov/solar/images/photo_08437.jpg http://www.solarhome.org/cahill1.gif http://www.kootenay.com/~aurora/house.jpg http://images.encarta.msn.com/xrefmedia/sharemed/targets/images/pho/t045/T045299A.jpg http://www.thenaturalhome.com/htmexterior31.jpg

http://www.kiraly.at/images/rum.jpg

http://www.acca21.org.cn/image/p3-10-1.gif http://designcoalition.org/projects/projectp/bayview/oldbayview1.JPG http://www.solaror.org/fig_pass6.jpg http://hpb.buildinggreen.com/projectfiles/project_34/RMI2Right.jpg

http://www.archkom.de/bilder/juwi0006_200.jpg http://www.oberlin.edu/envs/oeeaa/graphics/environmtl_bldg.jpg

http://www. greenhouse. gov http://www.greenhouse.gov.au/yourhome/technical/images/thumbs/fs10/1_3h.jpg http://chinahousing.mit.edu/english/findings/shenzhen/shading_study/image001.png http://www.solarenergysociety.ca/2003/images/dia4eng.gif

Passive Solar Design N S E. Burch Solar View Estate Swarthmore, PA Summer rays at solar noon N S Winter rays at solar noon A 15 cm West windows 3 cm 3x3 3x3 11 cm 74.5 degrees B South window 12 x 8 (C) 27.5 degrees 14 cm Ground level All measurements in centimeters…drawn to full scale

Calculating Solar Angles Spring/Fall Equinox P N P 27.5 degrees above the ground Parallel Rays To the Earth Winter in NA Sun Difference in tilt = 23.5 + 23.5 or 47 degrees N Summer in NA P 74.5 degrees above the ground

What is the Tropic of Cancer? Summer in North America Tilt of Earth on its axis is 23.5 degrees N S Tropic of Cancer 23.5 N Lat. Equator Sun’s rays Equ. At solar noon, sun angle is 90 degrees above the ground if you live on the Tropic of Cancer If you live in Philly sun would be 90 – 15.5 = 74.5 degrees above the ground 15.5o 39o 23.5o EQU. Philadelphia’s Latitude