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Before there were clocks, people used shadows to tell time. In this outdoor activity, learners will discover how to tell time using only a compass, a pencil, a handy printout, and a sunny day.

Learners observe different light sources, outdoors and indoors, using prism glasses (diffraction glasses) and color filters.

This fun and simple hands-on astronomy activity demonstrates the shadow of the Earth as it rises as a dark blue shadow above the eastern horizon.

In this activity, learners explore properties of water and watch evaporation happen by "painting" with water in the sun.

This fun and simple hands-on astronomy activity lets learners make 3-dimensional models of the Earth and Moon.

In this activity, learners observe tide pool animals in a touch tank to consider how they survive.

In this activity, learners use a simple 3D model to discover why the Moon has phases.

In this activity, learners model the flow of energy from the sun as it enters a photovoltaic cell, moves along a wire and powers a load.

In this water activity, learners discover ways to move water across the water table.

Glare from the sun and ripples from the wind can make it hard to see what's below the surface of a body of water.