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 33
; and in, the fame manner we may proveAEF-J-CFE== two right angles. xxxv. In any triangle ABC, oneof its legs, as BC being pro.duced towards D, the extern-al angle ACD is equal to boththe internal and oppojite anglesABC, BAC taken together.To prove this, through Cdraw CE parallel to AB ; then fince…
Navigation · Nautical astronomy
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