[legulere]

I asked myself how the gyroscope manages to point always to point to the same direction. The answer is that only objects moving translational form an inertial frame, rotating objects don't:

> Due to Earth's rotation, its surface is not an inertial frame of reference. The Coriolis effect can deflect certain forms of motion as seen from Earth, and the centrifugal force will reduce the effective gravity at the equator. Nevertheless, it is a good approximation of an inertial reference frame in many low precision applications.

https://en.wikipedia.org/wiki/Inertial_frame_of_reference