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Students observe how their (sun) shadow changes throughout the day and seasons. \ 90 o Me and My Shadow

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A shadow is created when an object blocks a light source, leaving an unlit area. The size of the shadow depends on the size of the object and the position of the light source.

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Shadows and Sunlight 90 o 30 o The shadow you create by blocking sunlight changes through the day as the position of the sun in the sky changes.

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Shadows and Sunlight You can determine the position of the sky by using your height, your shadow length and some simple trigonometry Angle = ArcTan (your height / your shadow’s length) your height your shadow’s length If your height = 100 cm and your shadow’s length = 100 cm: Angle = ArcTan (100 cm / 100cm) = ArcTan (1) = 45 degrees

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Shadows and Sunlight The angle can also be determined graphically with a protractor. Graph as shown below with X=shadow length, y=height 100 cm 45 o

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Shadows and Sunlight The angle can also be determined graphically with a protractor. Graph as shown below with X=shadow length, y=height 100 cm 30 cm 73 o

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