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. 這個方法讓弗蘭斯迪收集到許多星球位置的資料，比使用六分儀或四分儀做角度測量所得到的資料更為精確。
Radians are another way to measure angles. 弧度是另一種度量角度的方法。
An indicator or a sighting apparatus on a plane table,used in angular measurement. 旋標裝置飛機控制板上的指示器或觀測儀，用來測量角度。
