photoelectric sextant

例句：

1. 1. The photoelectric sextant is used to measure the angle between two points on a map.
   光电六分仪用于测量地图上两点之间的夹角。
2. 2.The photoelectric sextant was developed by the American engineer Edwin Landis in the early 20th century.
   光电六分仪是由美国工程师埃德温·兰德斯在20世纪初开发的。
3. 3.The photoelectric sextant is an essential tool for surveyors and geologists who need to measure distances and angles accurately.
   光电六分仪是测量员和地质学家进行精确距离和角度测量的重要工具。