象限仪，为天文仪器，主要用于测定天体在地平上的或天顶距。历经四年于康熙十二年完成，主要由象限环、数轴、竖轴、横轴、窥横等组成。
When the precision quadrant is testing, the measuring workstation will finish the functions of sample, calculation, display, printing and storage and so on.
利用精密智能电子象限仪对倾斜台、摇摆台各种角度进行检测,由测量工作站完成检测数据的采集、计算、显示、打印和存储等功能。
参考来源 - 倾斜台、摇摆台精度校验装置的研制·2,447,543篇论文数据，部分数据来源于NoteExpress
早期测定纬度的仪器是象限仪，测量北极星或正午太阳的高度。
The earliest instrument for determining latitude was the quadrant, which measured the altitude of the polestar or the noonday sun.
论证了长期以来存在的用象限仪标定炮耳轴倾斜传感器的方法误差。
In this paper, it is founded the error existed for a long time, which is caused by using the quadrant improperly to refer the trunnion-tilt sensor.
天文学家对本周的象限仪座流星雨进行了观测，然而他们更多的是沉醉在星光之下，而非忧虑。
Though as stargazers look up at the sky for this week's Quadrantid meteor shower, they are more likely to enjoy the beauty of the sight than feel anxious.
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