ALTITUDWIBVS ALICVJUS STELLAE. 97 



acquatione, Tcd inueftigando cx pracccdcntibus al- 

 ticudincs (lcllae culmiuautis, Icntcntiam mutarc co- 

 aclus lum. 



IV. Nam imicnto ( §. II. ) angulo BKI ejus 

 complemcntum angulus KBI datus eft, atque adco 

 arcus CT, cujus rcmisfis iUius mcnfuracfl; hanc ob 

 jcm diibitur quoque arcus BCT •, atqui demifra cx 

 ccntro circuli normali OX in fi,ibtenram BT , ipfa 

 BX vcl XT aut ipfis aequalis OV , dudis nempe BV 

 parnllcla OX, ct per ccntrum O refla QR aquidiftan- 

 tc ipfi BI. Itaque fi in diametro alius circuli, cujus 

 radius —i , capiatur ;\ ccntrointeruallnm analogum 

 ipfi OV acqualc finui fcmislis anguli BOT, atquc in 

 illa diamctro partcs analogac ipfis QV et RV dican- 

 tur r ct .r, quae vtique datac funt , inucnicntur in 

 fchem.\tc QVrrr.v, et RV— f.v, adeoquc QS(=:BI 

 -4-QV)-^^^i£^^^, et RS(-BI-VR)-^^-^. 



Eft vero vtBlr=-^).BF(^)::QS(=°^f^,=^*). fin. 

 alt. flcil. in Qi'-^^) , et Bl(^"^). BF(^)::RS 

 (=-^--^). Sin alt. ftell. in R(— ,?^'). Ex quibui 

 conftat, quod altitudines mcridianae flcllae noftrac 

 maxima in Q, et minima in R datae fint. Scmifiis 

 vcro cxcefTus altitudinis maximac fupra minimam 

 dat clcuationcm acquatoris , ejusque complcmcn- 

 tum Eleuatiouem Voli ^ ct cxccfrus maximae altitudi- 

 nis ftcllae fupra clcuatioucm aequatoris, Deiliniitio- 

 ncmStellae^ quac erant inuenicnda. 



Tom. IV. N SO- 



