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(gè)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(guān)測儀，用來(lái)測量角度。
