... 正垂线 horizontal-profile line 中垂线 midperpandicular; midperpendicular; perpendicular bisector 主垂线 prime vertical; principal line; principal vertical line ...
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altitude on the prime vertical 东西圈高度
magnetic prime vertical 磁东西圈 ; [地物] 磁卯酉圈 ; 磁主垂面
true prime vertical 真东西圈
grid prime vertical [航] [水运] 格网主垂面
compass prime vertical [航] [水运] 罗盘的东西圈
prime vertical transit 卯酉面中星仪
altitude of the prime vertical 东西圈高度
the prime vertical circle 主要的垂直圆
以上来源于: WordNet
N the great circle passing through the observer's zenith and meeting the horizon due east and west 卯酉圈 [astronomy]
They are the curvature corrections for recording time at the determined zenith distances when a star passes the prime vertical and the meridian circle.
卯酉方向天顶距的星径曲率改正以及子午方向天顶距的星径曲率改正。
For open or semi-open layout of the pump, general pump and prime mover so that the axis and the vertical axis of pipe gallery.
对于露天或半露天布置的泵，一般使泵与原动机的轴线与管廊轴线垂直。
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