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 163
etic amplitude at riftng is E. z6° i x N. the true,amplitude is E„ 140 z<f N. required the. variation ? From the greater E.26°.i2NoTake the lefler E. 14 20 N. Remains variation 11^52 E, The variation in this exam-ple is eafterly becaufe the true,amplitude falls to the right ofthe magnetic, and… … EXAMPLE II. The moons true amplitude at rifmgwas found to be E. 150 20 N. andhermagnetic amplitude E. jo° o S, re-quired the variation ? True amplitudeMagnetic amplitude E. i502oN. £. 10 pS. The fum is the variation. 2^ jp W. EXAMPLE IV, -The ftar Aldebaran was obfervedat rifing to bear by compafs…
Navigation · Nautical astronomy
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