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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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