1. Other early instruments included the sextant and the astrolabe.
另外的早期仪器还有六分仪和星盘。
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2. Other early instruments included the sextant and the astrolabe.
另外的早期仪器还有六分仪和星盘。
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3. Other early instruments included the sextant and the astrolabe. Longitude (used for navigation with increasing success in the 17th-18th century) was fixed using chronometers and tables showing positions of celestial Bodies throughout the year.