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.
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.
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