Sextant

例句：

1. 1. The astronomer used a sextant to measure the angle of the star.
   这位天文学家使用六分仪来测量恒星的角度。
2. 2.He was using a sextant to find his way home.
   他正在用六分仪寻找回家的路。
3. 3. The sextant helped her determine the position of the planet Mars.
   六分仪帮助她确定了火星的位置。