43» OBSERrJTlONrM imiENSirM 



qiie apparitionis liaiitibus nimis ardlis circnmfcripta non 

 cft , led nd 15. plurcsquc dies cxtenditur. Aliam igitur» 

 praetcr illuii HalLji , conditioncm , attcndcrc ncccdc crit. 

 Scilicet fitus Vcncris rcipcdu horizontis in cnmputum i]UO- 

 que trihi dcbcbit. M.inente enim Veneris fulgore , quem 

 a Sole recipit ifta , ecxiem , confpcdus Vcneris intcrdiu 

 fiicilior dctur nccelTc ert , fi ifta infigncm fupcr horizon- 

 te altitudniem habiat , Sole locum dtprcniorcm cKcupan- 

 te , ac fi Vencri liorizonti viciiiiori dcbilit.itio lucis ex 

 maiori v.iponun Atmofphacnic copia accid.at. Vt igitur 

 conditioncm h-.inc rcgulis gcnenilioribus cxplicarc iiccat , 

 (cquentes hypothefes uitroduccre conucnict. Fingannis , 

 Vcncrem , quippe ab Eciiptica non multum cuagantcm , 

 in Echptica fcmpcr inccdcrc ; tcmpus autem , quo Ve- 

 nus interdiu nudo ocuio conljjici dcbcat , rcftringatur ad 

 momcntum ortus vel occafus Solis. His pofitis conditio- 

 nes alfignare dcbemus , fub quibus Vcnus , acccdentc ad 

 irtas hypotliclcs Hallcji conditionc, maximam liiper iiori» 

 xonte altitudincm acquirat. Rcfcrat H E Z mcridianum , 

 |rip. 5. Z Zcnith , H A S horizontcm , E V S Edipticam co in 

 fitu , qui pro data poli cicuntione locum habct , Sole ad 

 S in horizonte ad datum dicm conftituto. Diftct nunc 

 Vcnus in 1-Aliptica a Solc arcu VSrr^o. grid. vi con- 

 ditionis Hallcjanac , et pcr l^Kum Vencris V dutftus fit 

 circulus vcrticalis Z V A ; crit V A altitudo Vcncris , 

 quac liypothcfibus fupra didis ct conditioni Hallcjanae 

 rcfpondct. lliec maxiina , mancntc poli clciiationc , rc- 

 quiritur , fi cafus maximc idoncus pro apparitionc Vcnc- 

 ris intcrdiu cxiftcre debcat. Eft aiitcm in trian^ulo SV A 

 ad A rcc^^angulo fin. tot. : fin. S V — fin. V S A : fin. 



VA; 



