2024 © Maxim Tabachnik
海用六分仪
这款六分仪由 Husun(伦敦 H. Hughes & Son)于 20 世纪制造,通过允许测量高达 120° 的角度,对八分仪进行了改进。它使航海者能够通过观测天体高度并测量水平角度,更精确地计算纬度。
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