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Z轴
飞机的垂直轴 (vertical axis),或者称为法轴 (normal axis),或者称为偏航轴 (yaw axis)
ZD zenith distance 天顶距
avia.
Z-axis
(对于地平线上方的天体,地平径圈上天定和天球上的点之间从天顶转过90°测得的距离,又称余纬度 (co-altitude))
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