Complex Spherical Sundial has
unique ability to trace both angular
velocity of the ball's shadow and its linear advancement by both linear and circular grooves
respectively. The device has
to be directed so the initial position
of ball's shadow is set right above
smallest central circular groove.
Ball's shadow should move
evenly passing each following
circular groove every 10 minute,
steady keeping its direction
over a linear groove.
This didactical toy shows constant rotation of Earth proving that it is cause of Sun's apparent movement.
Complex Sundial design is created by Andrija Radović, http://www.andrijar.com All inquiries should be sent to firstname.lastname@example.org