A carousel or carrousel, merry-go-round (international), Galloper (international) or roundabout is a type of amusement ride consisting of a rotating circular platform with seats for riders. The "seats" are traditionally in the form of rows of wooden horses or other animals mounted on posts, many of which are moved up and down by gears to simulate galloping, to the accompaniment of looped circus music.
A French old-fashioned carousel with stairs in La Rochelle
Carousel feast at the Grand-Place in Brussels in 1565 to mark the wedding of the Duke of Parma
The Carousel organised in the courtyard of the Tuileries Palace by Louis XIV in June 1662 to celebrate the birth of his son and heir apparent
Pictured in Margate, England in the 1880s, Savage's amusement ride, Sea-On-Land, where the riders would pitch up and down as if they were on the sea. His "galloping horse" innovation is seen on carousels today.
Rotation or rotational motion is the circular movement of an object around a central line, known as axis of rotation. A plane figure can rotate in either a clockwise or counterclockwise sense around a perpendicular axis intersecting anywhere inside or outside the figure at a center of rotation. A solid figure has an infinite number of possible axes and angles of rotation, including chaotic rotation, in contrast to rotation around a fixed axis.
Star trails caused by the Earth's rotation during the camera's long exposure time