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This is an activity about the expansion of the Universe. Learners will use a special set of transparency and master sheets with dots representing clusters of galaxies at two different eras of the Universe's history. After aligning the transparency... (View More)

This is an activity about time. Learners will construct a pocket sundial to determine the time of day by using the shadow of a string cast on the dial and will observe the changing position of the shadow as the Sun appears to move across the sky.... (View More)

Audience: Middle school

This is an activity about time. Learners will construct a pocket sundial to determine the time of day by using the shadow of a string cast on the dial and will observe the changing position of the shadow as the Sun appears to move across the sky.... (View More)

Audience: Middle school

This is an activity about the Sun's position in the sky. Learners will use a clear plastic hemisphere to create a model of the sky and mark the position of the Sun in the sky on the hemisphere several times throughout the day. From this information,... (View More)

Audience: High school

This is an activity about observing sunset positions. Learners will observe the position of sunset over the course of two to three months, at minimum, or up to a year, at maximum, and discuss results and predict future sunset locations. This is... (View More)

This is an activity about observing sunset positions. Learners will observe the position of sunset over the course of two to three months, at minimum, or up to a year, at maximum, and discuss results and predict future sunset locations. This is... (View More)

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