The world’s largest mobile sundial

Witness the live construction of a 21st century sundial!

On a clear space, the dial maker installs his equipment and mounts a large sundial, calculated for the date and place. 

Throughout the construction, he is available to explain and comment on his work. 

Participants check the time on their watches (actually, their phones!)

The Castillon dam hosts the largest sundial in the world – but it is fixed. For you, we build a mobile one!

Everyone leaves with their photo in front of the dial.

Duration of activity
All day

Subjects:
Mathematics, Physics

Level:
All levels

Key message:

  • Understanding the difference between solar time and watch time