media ntinquam notabiliter dcfledlere potefl:, ex lioc arcn!o 

 27 = w facile colligentur corredionas in longitudine ori- 

 iindac. Hiinc in finem dncatur ex j ad zq perpendicu- 

 lum yr et quia in triangulo zjr habetur latus js — u ct 

 angulus zjr— angulo Qyp, qui angulus fi vocctnr ni or, 

 erit j^rrrucor.o" ct srzrufin.cr, quae poflerior particula 

 zr manifeflo dabit corredionem atcusjp, qnippe quac ad 

 yp addita dabit arcum ;s q feu latitudinem Lunae veram. 

 Deinde vcro pro longitudinc notetur effe p^-.jr- i : cof.jpi, 

 Ynde fit p^— |^^, ficque particula p^ ab arcu ^p fub- 

 trada dabit arcum ^ q , -vnde prodibit longitudo vera 



§, 52. Quia angulum Q,yp vocauimus —(7, ex 

 trigometricis conftat fore:,^ .,, 



tang. » tang. 0- — fec. tiy — ^;^:j~-) ' '^^^^^^^ 



tang.o-=r:^^-jV:^,. Deinde autem efl 



fin..y p z=. i;m^_^+^fin.^»_vn_de_fit 



cof.j p — y 1 — fni. i' fin. ( r 4- ? )* 

 Ex priori vero formula efl 



COf <T — _f'n,ilcof-{r-^() 



V coj. I' -f- (/«.'«/.(»■ -f- f )» 



vbi manifefto efl 



I — fin.i=fin.(r+^)* — cof.i' + fin.i'cof.(f+j)' 

 liinc igitur fit 'Voi 



_£p/. q^ /!n.i cof,{r-^ -() ■ 



iof.y p I — im. njin. ( r -(- f )» 



Pracfiat autem prioribus fbrmulis vti, poftquam angulus or 

 efl exploratns. 



' ■§! 5:5; Cum autem haec corre<ftio calculum non 

 exiguum requirat, hoc negotium multo facilius expcdiri pofle 

 videtur, fi, mifTa omni approximatione, calculum accuratc 



' V infli- 



