graduated arc 中文意思是什麼
graduated arc
解釋
分度圓弧-
An early instrument for measuring altitude of celestial bodies, consisting of a90 = graduated arc with a movable radius for measuring angles
象限儀用來測量天體緯度的一種早期工具,由一個有90度刻度的圓弧和一個用來測量角度的可移動的半徑構成
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