Sunny's Sundial Adventure

"Hi! I'm Sunny! Let's learn how people told time before clocks!"
Time: 12:00 PM
A sundial uses the sun's shadow to tell time! The triangle (called a gnomon) casts a shadow on the numbers. When the sun moves, the shadow moves too!

Let's Play!

12:00 PM
Sun is: High in the sky
40°

Move the slider to see how sundials work in different places!

Did You Know?

People used sundials over 3,500 years ago in ancient Egypt!
Sundials need to point North to work correctly!
Sundials don't work at night or on cloudy days!

How to Play

  • Drag to look around the sundial
  • Scroll to zoom in and out
  • Move the Time slider to see the shadow move
  • Click "Watch the Day" to see the sun move across the sky