Nova's Time Travel Adventure

Hi everyone! I'm Nova. Today, we're traveling back in time...

...to see how people told time without clocks! Look! In ancient times,

people used the Sun to keep track of the day. They built sundials.

As the Sun moves across the sky, the shadow moves to point at

numbers. But what happens when the Sun goes down? At night,

they looked at the stars instead! Constellations acted like a giant glowing clock in the

sky. Isn't science amazing? Ancient people were so clever! They used nature

to understand the world, just like we do today.