The gradually twisting path of the pendulum proved that the earth rotates as it moves through space.

There he had a 24in mm reflector telescope, for which he pioneered the use of an equatorial mount for easy tracking of objects as the earth rotates.

The light beams travel through vacuum tubes and are combined optically, requiring a building 100 meters long with movable mirrors to keep the light in phase as the earth rotates.

Stand up, rotate slowly to the opposite side and repeat.

After this, the cube was made to rotate slowly while the subjects watched.

Two honeycomb disks rotate slowly at 20 rpm with both inlet and exhaust airflows passing through them, but separately.

At the same time, the funnel may rotate slowly, so that orbits form rosettes rather than ovals.

On it, the choir and preachers would rotate slowly.

Their actions are to extend and ipsilaterally rotate the head and neck.

The machine uses an electronic spindle to quickly rotate the head as it pushes it into the material, then pulls it along whilst it continues to spin.

Youngsters who start rotating their heads early therefore have an advantage that can rapidly accumulate.

The infraspinatus and teres minor rotate the head of the humerus outward (external, or lateral, rotation); they also assist in carrying the arm backward (extension of the glenohumeral joint).

The super-flexi birds can rotate their heads 270 degrees, handy to keep a beady eye on prey.