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aeronautics
Aeronautics (from the ancient Greek words ὰήρ ''āēr'', which means "air", and ναυτική ''nautikē'' which means "navigation", i.e. "navigation of the air") is the science or art involved with the study, design, and manufacturing of air flight capable machines, and the techniques of operating aircraft and rockets within the atmosphere. The British Royal Aeronautical Society identifies the aspects of "aeronautical Art, Science and Engineering" and "the profession of Aeronautics (which expression includes Astronautics)." 〔(A Learned and Professional Society ) (Retrieved 8 March 2014)〕
While the term—literally meaning "sailing the air"—originally referred solely to the science of ''operating'' the aircraft, it has since been expanded to include technology, business and other aspects related to aircraft.
The term "aviation" is sometimes used interchangeably with aeronautics, although "aeronautics" includes lighter-than-air craft such as airships, and includes ballistic vehicles while "aviation" technically does not.〔
A significant part of aeronautical science is a branch of dynamics called aerodynamics, which deals with the motion of air and the way that it interacts with objects in motion, such as an aircraft.
==History==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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