alb2046418

Cross-staff in navigation

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.
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Titre: Cross-staff in navigation
Légende: Voir la 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
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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)