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1 Shadows and Solar Zenith Name Lab Partner Section Introduction: The solar zenith angle is defined to be the angle between the sun and a line that goes straight up (to the zenith) In reality the sun is very far from Earth and relative to this distance the Earth is very small. In the drawing (below right) The Earth is drawn much larger than it should be if the vertical scale matched the horizontal scale. The main point is that all rays that leave the sun and hit the Earth travel essentially parallel to each other as they reach Earth. In the figure at left Z is the zenith angle and A is the altitude (A=90-z); the angle from the horizon to the sun.

2 Below are 3 figures showing the position of the sun for Winter Solstice, Summer Solstice, and the Equinoxes.

5

6 Part 2. Home design for energy efficiency. (see video) The House above has a roof angle of 45. It has a southward facing window that is 6 ft tall and 1 ft from the roof top. Assume your design is for Vancouver, WA. Using the grid space on the next page draw a careful scale drawing of this home (The drawing above is just a sketch and cannot be used for good results.) 4. How long does an eve (overhang) have to be to just block out all sunlight from getting into the window at noon on June 21? Hint: A ray of sunlight that just hits the bottom of the window will not get into the window. So carefully draw this specifc ray and then draw your eve to block out all other rays above that key ray. Length of eve (overhang) = ft 5. With this overhang how high up the window does the sunlight get at noon on Dec. 21? Your eve has been established. Draw a ray of sunlight coming from the direction of the winter zenith that also just touches the tip of your eve. Al rays of sunlight below this special ray will go into the window and warm the house. Height up the window at noon on Dec 21=

7 It s easiest if you draw your house on the right side of the grid lines so you have plenty of room to draw in your solar rays. Also, you really only need to draw the front of the house (window side) and the 45 0 roof line to answer the questions.

8 Part 3. The photo below of a beer setting on a flat rock was taken on August 26, What time of day is it? a. early morning b. late morning c. noon d. early afternoon e. late afternoon. f. not enough information

9 The graph below shows the solar declination for different times of year. Remember that the declination is the latitude for which the sun is directly overhead at that specific time of year. Using this information, at what latitude was the beer photo taken? Latitude= Other questions The sun is directly overhead at Bangkok Thailand (latitude 14 o N): a.once a year b.twice a year c.four times a year d.never On what day would you expect the sun to be overhead at Bangkok Thailand (latitude 14 o N):? a.september 15 b.december 22 c.february 4 d.march 10 e.april 27 On what day would you expect the sun to be overhead at Miami Florida (latitude 26 o N):? a.september 15 b.december 22 c.february 4 d.march 10 e.april 27 f. never

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