The new American practical navigator : being an epitome of navigation, containing all the tables necessary ... (1802)
Bowditch, Nathaniel, 1773-1838, Lee, Marvin, former owner. DSI, Stuart, Gilbert, 1755-1828 DSI, Burndy Library, donor. DSI · [Salem] : Printed at Newburyport, Mass., 1802, by Edmund M. Blunt, for Cushing and Appleton, Salem : Sold by every book-seller, ship- chandler, and mathematical-instrument-maker in the United States and West Indies · leaf 36
e archAC on which it ftands muft fee lefs than a femi-circle, and the half of it lefs than a quadrant ora right angle ; but the angle A B C in the fegmentis meafured by the half of the arch A C ; thereforeit is lefs than a right angle. An angle hi a femicircle is a right angle ; forfince D E F is a… … An angle in a fegment lefs than a femicircleis greater than a right angle; thus if GHIbe a fegment lefs than a femicircle, the archGLI on which it ftands muft be greater thana femicircle, and its half greater than a quad-rant or right angle ; therefore the angle GHIwhich is meafured by half the…
Navigation · Nautical astronomy
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