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Shadow Study: Understanding the Movement of Shadows and Sunlight

Explore how students observe shadows changing with sunlight patterns throughout the day and seasons. Learn about the formation of shadows when objects block light sources and the influence of object size and light position on shadow size. Discover how to calculate the position of the sun using trigonometry and graphical methods with simple tools like a protractor. Dive into the science of shadows and sunlight to understand the angles and relationships between height, shadow length, and sunlight positions.

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Shadow Study: Understanding the Movement of Shadows and Sunlight

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

  2. Me and My Shadow 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.

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

  4. 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) If your height = 100 cm and your shadow’s length = 100 cm: Angle = ArcTan (100 cm / 100cm) = ArcTan (1) = 45 degrees your shadow’s length your height

  5. 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 45o 100 cm

  6. 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 73o 30 cm

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