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Titre: Cross-staff in navigation
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Traduction automatique:
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
Crédit: Album / Universal History Archive/Universal Images Group
Taille de l'image: 3692 × 5214 px | 55.1 MB
Taille d'impression: 31.3 × 44.1 cm | 1453.5 × 2052.8 in (300 dpi)