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海用六分仪
Portuguese Maritime ExplorationsMarine SextantNautical QuadrantLongitude Calculation DeviceA Portuguese CaravelModel of the Slave Ship VigilanteSaint Anthony as Military CaptainBahian Sailing CanoeBoat from the RecôncavoPortuguese Carrack São GabrielView from the Farol da Barra

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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