an^ulis N et M; et acqu.itioiiis potiinnium tcrmino lo»a- 

 rithniici^ ct arcu ciicuKiri complicafac retolutio calculos 

 rcquirunt opcrofiorcs, quani vt in ipfa praxi ad ilhis 

 formulas rccurri p;)irit ; ncque magis patct, quomodo hac 

 formulae, in qubus modo mcmoratac quantirates , a poa- 

 dcre partim et diamctro globi , partim a ia<flus obliquita- 

 tc et ccleritate initiali pcndentej , diuerfimode iutcr fe 

 complicantur, ad conllrudioncm tabularum rcuocari que- 

 antj id quod (cqucnti commodinimc ficri ratione reperi. 



Totus fcilicct calculus pro dato quolibet iacflu in- 

 ftitfiendus a valorc k, pcr qucm quan'itaies f ct g vna 

 cum angulis N et M dctcrminantur , ( §. 3.) adcoquc ab 

 acquatione cubica k'-i-Bk— BC=o, in qua data funt 

 B et C per conditionem iadus, primario pcndct; cuius 

 acquationis rcfolutioncm §. 3. datani iam fcquenti modo 



adornari conucniei: 



Sumto angulo 2 tu tali, vt fit 51£I — !?. tang. 2 u , 



fiue 



tang. 2 w =: ^. f^ , 



crit /=i "•;," (tang. z w + fcc. 2 o)) = ?-J-? tang. (4-5' + a)) 

 adeoqne 



k-^JV tang. (45° "^ <-) - ; "N. 



^^ ^ Vtang. (45" + ^/ 



Si igitur fumatur angulus a \|/ talis, vt fit 



■)/ tang. (45° -+- w) = tang. (45" -H v^) 

 erit k = ^J,'. (tang. (45' -+• vl') - cotang. (45* + 4')) 

 Cuc i = '^.tang. a 4/. 



Qtiar» 



