ss 



GREGORII FONTANiE 



ORD. SCHOL. PIAR. 



IN REGIO TICINENSI ARCHIGYMNASIO PUBLICl MATHESEOS PROFESS©RIS 



SCHEDIASMA Lììs ,,,^., 



PROBLEMATA ASTRONOMICA 



PROBLEMA I. -^' 



Hata Sider'is Dedinatione inven'ire ipjtus fupra HoYtxontem 



Altitudineni ^ in qua fub data Poli elevatone Ahitudinis 



ejufdem Variatio contingit omnium maxima . 



Sol. 



;^^*,^^S Sto HI Horlzon, HO BRI Meridia- Tab.3. 

 ■ ^^ ■"§ nus , OSF Parallelus a Sidere de- ^'S-'- 

 ^''^^i'Ij^ fcriptus ; fitqiie Sidus in S , Zenit in 

 E ilf-ckv ^ "> P<^^"^ in R, & captisi", s hm- 

 Ji^^ll M ""^ Propinquis , ac per Sp abfbiflb 

 ^5S-^^^s=^j(^ arcu Bp = SB , triangulum mini- 

 ?t^^^P*^^^'M mum Sps reftangulum erit in p. 

 Caetera porro fiant ut in Schemate . Sit jam RS com- 

 plementum datae Sideris Declinationis = a ; complemen- 

 tum elevationis Poli RB — c; complementum BS AI- 

 titudinis inveniendae == x , cujus variatio ps , feu d x 

 ditferentiata 5 ac nihilo ffiquata, qusfitam fuppeditabit Si- 

 deris Altitudincm . Jam vero li accipiatur Ss = i^ fiet 

 ps , feu d X = coi. Ssp — cof. OSB = ( ob reé^um 

 anguluni OSR^ {\n. BSR. Ex notis autem Trigono- 

 metria: 



