How do we know that the Earth spins around its axis?

Abstract

A carousel gives possibilities to explore physics in rotating systems and to gain first-handexperience of methods to measure rotation, without the need for an external reference. Thispaper discusses the Foucault pendulum, as well as the sideways deflection of horizontallyand vertically moving objects in a rotating system. These experiments lay the foundationfor an understanding of ways to demonstrate that the Earth spins around itsaxis.