UEN Security Office
Technical Services Support Center (TSSC)
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Students will make a sundial and learn how to use it.
Earth makes one complete rotation on its axis every 24 hours. During the 12 hours Earth faces the sun, the sun appears to move from the eastern horizon to the western horizon in a path across the sky. The sun is stationary with respect to the revolution of Earth. The suns apparent movement is caused by Earths rotation. A sundial can use the suns shadow to measure time based on the position of the sun in the sky.
Pre-Assessment/Invitation to Learn
Ask students if their shadows are always the same length or in the same place. Is it always the same length and shape? Do they notice anything about the time of day and the location and shape of their shadow?
Observational descriptions in students journals:
Check for accuracy on page 7 of their journals.