AOSC200Lect4

AOSC200Lect4 - AOSC Lesson 4 Angle of incidence

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Unformatted text preview: AOSC Lesson 4 Angle of incidence http://www.youtube.com/watch?v=taHTA7S_JGk Angle of incidence http://www.youtube.com/watch?v=taHTA7S_JGk Fig. 2.15 Fig. 2-11, p. 41 Fig. 2-12, p. 42 HEATING OF THE EARTHS SURFACE DEPENDS ON THE AMOUNT OF SOLAR RADIATION PER UNIT AREA. SAME AMOUNT OF RADIATION IS DISTRIBUTED OVER A LARGER AREA IN A THAN IN B. RADIATION PER UNIT AREA IS LESS IN A THAN IN B. LESS HEATING IN A THAN IN B. The Earths Orientation EARTH'S AXIS IS NOT PERPENDICULAR TO THE PLANE OF ITS ORBIT AROUND THE SUN. IT IS TILTED 23.5 DEGREES FROM THE PERPENDICULAR INCLINATION OF THE AXIS. WITHOUT THIS INCLINATION WE WOULD HAVE NO SEASONS. THIS CHANGES THE SOLAR ZENITH ANGLE OF THE SUN, AND THE AREA COVERED BY A BEAM OF SUNLIGHT AREA COVERED BY BEAM IS PROPORTIONAL TO 1/COS OF THE SOLAR ZENITH ANGLE IN COLLEGE PARK, SOLAR ZENITH ANGLE OF THE SUN IS 67 DEGREES ON DEC 22, AND 19 DEGREES ON JUNE 22. THE RATIO OF 1/COS OF THE ANGLES IS ABOUT 2. TWICE AS MUCH ENERGY FALLS ON UNIT AREA AT THE GROUND IN SUMMER THAN IN WINTER. THE LENGTH OF THE DAY ALSO VARIES WITH SEASON ALSO A RESULT OF THE INCLINATION OF THE EARTH. Fig. 2-15, p. 43 Fig. 2-16, p. 44Fig....
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AOSC200Lect4 - AOSC Lesson 4 Angle of incidence

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