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This is a lesson plan for an activity about the nature of the Sun's apparent motion throughout the day. Learners will follow detailed instructions to construct a sundial using everyday materials and make measurements of the shadow cast by the sundial. Learners use the shadow cast by the sundial to track the motion of the Sun throughout the day and use these measurements, geometry, and trigonometry to make calculations of altitude and azimuth of the Sun, as well as the time of true local noon and the altitude of the Sun at true local noon. Measurements can be taken during one day only, for a few days, or on many days throughout an entire year to get a more complete picture of the Sun’s apparent motion. This activity requires daytime access to a sunny outdoor location over the course of several hours. This is an activity in the Touch the Sun teacher's guide.
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