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Salem Maritime National Historic Site A 19th century canton ware serving dish, with chinese scenes in blue and white. NPS photo.
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Salem Maritime National Historic Site
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The octant is a navigational tool based on the curve of one eighth of a circle. It measures angles for solar and celestial navigation.

Did You Know?
In 1799, Salem native Nathaniel Bowditch revised John H. Moore's New Practical Navigator, the standard navigation manual of the 18th century. Bowditch discovered and corrected over 8,000 errors in Moore's manual! In 1802, Bowditch published the New American Practical Navigator.

Last Updated: January 06, 2012 at 14:59 MST