This allowed him to gather more accurate information on star positions than had hitherto been possible by making angular measurements with sextants or quadrants alone. 这个方法让弗兰斯迪收集到许多星球位置的资料，比使用六分仪或四分仪做角度测量所得到的资料更为精确。
Radians are another way to measure angles. 弧度是另一种度量角度的方法。
An indicator or a sighting apparatus on a plane table,used in angular measurement. 旋标装置飞机控制板上的指示器或观测仪，用来测量角度。
