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 123
to the diftance 161 ;this doubled gives the difference of longitude 322 milei nearly. IX <$ Middle latitude sailing; CASE V. hath latitude* and defiance given, to find the courfe, departure, and differ* ence of longitude. Suppofe a fhip fails 300 miles north-wefterly, from a place in the… … By PROJECTION. T)tzw the meridian ACD, on which fet off DC equal to the difference oflatitude 240 miles ; draw the line CB perpendicular to DC ; take thediftance 300 Li your compaffes, and with one foot in D fvveep an arch cut-ting CB in B ; join DB ; make the angle CBA equal to the middle…
Navigation · Nautical astronomy
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