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Title: Cross-staff in navigation
Caption: 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
Category: UIG HISTORY
Credit: Album / Universal History Archive/Universal Images Group
Image size: 3692 × 5214 px | 55.1 MB
Print size: 31.3 × 44.1 cm | 1453.5 × 2052.8 in (300 dpi)