‘Making tides’ explains the forces that generate tides and the scientific discoveries that helped to explain them. Every point in the ocean experiences a tide-generating force changing in strength and direction, with rhythms set by the motions of the Earth, Moon, and Sun. In general, this force will have east–west and north–south components and each of these will change in different ways with time. The most important effect is that set by the spinning Earth within the Moon’s orbit. The deflection of moving objects on a spinning Earth to the right in the northern hemisphere and to the left in the south is called the Coriolis effect.