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Título: Cross-staff in navigation
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Traducción automática:
Cross-staff In navigation the instrument is also called a cross-staff and was used to determine the vessel's latitude by measuring the altitude of Polaris or the sun, The Jacob's staff, when used for astronomical observations, was also referred to as a radius astronomicus
Crédito: Album / Universal History Archive/Universal Images Group
Tamaño imagen: 3692 × 5214 px | 55.1 MB
Tamaño impresión: 31.3 × 44.1 cm | 1453.5 × 2052.8 in (300 dpi)