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https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13951005

Navigation: an astrolabe, a cross-staff, and a back-staff or Davis's sextant. Drawing after Edmund Gunter, 1624.

Original public domain image from Wellcome Collection

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Navigation: an astrolabe, a cross-staff, and a back-staff or Davis's sextant. Drawing after Edmund Gunter, 1624.

More