Jekels Jacht

Buys Ballot discovered the movement of the stars using the doppler effect. Diederik goes in search of the place where he carried out his experiment.

Gerrit Moll succeeds in 1823 in greatly improving the measurements of the speed of sound. Diederik Jekel will have to find two old cannons for the reenactment of this experiment.

The Middelburger Hans Lipperhey invented the telescope. Diederik travels to Zeeland to follow in Lipperhey's footsteps.

Christiaan Huygens designs a timepiece for use at sea. There, Jekel will have to make the clock again.