A polar projection of half or more of the celestial sphere on a chart equipped with an adjustable overlay to show the stars visible at a particular time and place.
星座一览图天体球的一半或多半在平面图上的极投影图，这种图具有可调节的遮蔽物以显示在给定时刻和位置可见的恒星
A handle or projection used as a hold or support.
柄一个柄或凸出物，作为把手或抓的东西
Relating to or made by projection.
投影的由投影制作的或与其有关的
