The earliest instrument for determining latitude was the quadrant, which measured the altitude of the polestar or the noonday sun.
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。
This paper introduces an online measuring instrument for mirror pendulum pose, which USES quadrant Si-photoelectric cell as the detector.
介绍一种用于在线测量平面镜摆动姿态的方法及装置。
This paper introduces an online measuring instrument for mirror pendulum pose, which USES quadrant Si-photoelectric cell as the detector.
介绍一种用于在线测量平面镜摆动姿态的方法及装置。
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