hinc 



« rr 66°. 30'. 16" et b ~u^~ ^6". 30'. i6".- 

 Porro 



/tang. A=: 8, 7193958 

 l iin. u —9j 96 2^1 2^^ 



8, 681 8082 



/fin. (Zi-f/) — 9, 774.4331 



/tang. w zr s, 9^^73751 

 Vnde declinatio Acus magneticae reperitur 4^ 37'. 8". 



§. 6. Cognita igitur Latitudine loci et declinatio- 

 ne Solis determinatio declinationis Acus magncticac pende- 

 bit a praccifione, quacum appulfus marginum jmaginis So- 

 lis ad capilliim pofitionem Acus defignantera obferuabun- 

 tur, qui teile experientia, fi Acus quicfcat, ad duo fecunda 

 exade obfcruari pofTunt. Hinc concJudere licet , quanta 

 exadiitudo ab hac methodc in exquirenda declinatione Acus 

 magnetieae fjt exrecflanda. Vt in gcnere appareat, quan- 

 tus error in declinatiouem Acus magneticae rcdnndet ab 

 crrore minimo in obferuatione commiflo differcntietur 

 aequatio 



fpeillatis 0) ec A vari^abihbiis; et prodihit error in decli- 

 nationem acus redundans ab crrore ^ A in obfciuatione 

 commilTo. In cxemplo fuperius allato, fi error in obfer- 

 uatione commiffus fit 4", vt </A fit ~ 6c" quo vix ma- 

 ior committi potelt, calculaperado repcritur du^zz—i'. 2^"- 



§. 7. 



