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Sinistral : ウィキペディア英語版
Sinistral and dextral

Sinistral and dextral, in some scientific fields, are the two types of chirality (“handedness”) or relative direction.
The terms are derived from the Latin words for “left” (''sinister'') and “right” (''dexter'').
Other disciplines have different terms (such as dextro- and laevo-rotary, in chemistry, or clockwise and anticlockwise in physics) or simply use left and right (as in anatomy).
Relative direction and chirality are distinct concepts. Relative direction is from the point of view of the observer. A completely symmetrical object has a left and a right side, from the observer's point of view, if the top and bottom and direction of observation are defined. Chirality, however, is observer-independent: no matter how one looks at a right-hand screw thread, it remains different from a left-hand screw thread. Therefore, a symmetrical object has sinistral and dextral directions arbitrarily defined by the position of the observer, while an object that has chirality can have sinistral and dextral directions defined by characteristics of the object, no matter the position of the observer.
==Geology==

(詳細はfault or the sense of movement within a shear zone. These are terms of relative direction, as the movement of the blocks are described relative to each other when viewed from above.
Movement is sinistral (left-handed) if the block on the other side of the fault moves to the left, or if straddling the fault the left side moves toward the observer.
Movement is dextral (right-handed) if the block on the other side of the fault moves to the right, or if straddling the fault the right side moves toward the observer.〔


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「Sinistral and dextral」の詳細全文を読む



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