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 137
ual to the departure 500miles, with an extent equal to the jdiftance 645 miles in your compaffes, ^and one foot in D fweep an arch cut- Xiug AB in A, join AD ; then willAB be the proper difference of lati-tude 407,5 miles,, and the angle BADwill be the courfe 500 49/ ; hencev/e have the other… … To find the courfe.As the diftance 645 2.80956 Is to the radius 90^ 10.00000 So is the departure 500 2.69S97 To fine of courfe 500 49 9.8S941 To find the. diff. of long,As radius 450 lo.oooQo Is to the mer. dif. lat. 589 2.7701 2So is tang, courfe 50° 49 10.08S79 Or thus,As prop, dif. lat. 407,5*…
Navigation · Nautical astronomy
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