Boston Public Library
Exhibitions

Atlantic Neptune Part 1 – Item 19 of 23

octant
Octant, First half of 19th century. Ebony, brass, ivory.
Courtesy USS Constitution Museum. USSCM Cat. #172.1
An octant was used to find one’s location north or south of the equator while at sea. Two mirrors– one fixed, the other moveable– bring the image of the sun into the direct view of the horizon. Measurements were compiled into nautical almanacs.

 

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