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Axes conventions are standardized ways of establishing the location and orientation of coordinate axes for use as a frame of reference. Mobile objects are normally tracked from an external frame considered fixed. Other frames can be defined on those mobile objects to deal with relative positions for other objects. Finally, attitudes or orientations can be described by a relationship between the external frame and the one defined over the mobile object. The orientation of a vehicle is normally referred to as ''attitude''. It is described normally by the orientation of a frame fixed in the body relative to a fixed reference frame. The attitude is described by ''attitude coordinates'', and consists of at least three coordinates.〔 〕 While from a geometrical point of view the different methods to describe orientations are defined using only some reference frames, in engineering applications it is important also to describe how these frames are attached to the lab and the body in motion. Due to the special importance of international conventions in air vehicles, several organizations have published standards to be followed. For example, German DIN has published the DIN 9300 norm for aircraft〔Luft- und Raumfahrt; Begriffe, Größen und Formelzeichen der Flugmechanik; Bewegungen des Luftfahrzeugs und der Atmosphäre gegenüber der Erde ()〕 (adopted by ISO as ISO 1151–2:1985). ==Earth bounded axes conventions== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Axes conventions」の詳細全文を読む スポンサード リンク
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