How do you tell time without a watch? Use the sun! This simple activity will show your child how to build his own sundial.

The apparent movement of the sun has been used to keep time since the bronze age. In this science fair project, kids plot solar time against mean solar time.

This science fair project idea teaches that time always passes at the same rate and nothing we do in our daily life âreallyâ affects how fast it moves.

Is it amplitude? Weight? Length of string? Kids will discover what factors changing the period of a pendulum depends on in this fun and easy physics experiment.

Learn how to tell time by the sun with this cool science fair project idea that tracks how the accuracy of a sundial changes over time.

This science fair project idea investigates how the height at which a pendulum is released affects the length of time it continues.

In this science fair project, learn how to make gears and find out why they transmit torques in predictable ways.