^30 METHODVS OBSERT'J?^DI 



poris , fcii diinmtc obfcruiuionc ph.ifeos lliclus pro ncquait 

 alfumi potcrt motui ccntri Solis , idquc fmcullo crrorc iii 

 corolhiriis indc dcduccndis alViijnando , quippc qui rcucra 

 it:i lc Iv.ibct , ct tcmporc tninfitus Solis pcr campum tu- 

 bi nulla , \cl non nifi prorllis contcmncnda diffcrentia iii 

 niotu corum oblcruari , idc]uc rarillimc tantum , ct ditli- 

 cillimc potclh Qiiodfi itaquc concipi;uniis lincam rt' g , a 

 punclo // eadcm cclcritatc pcrcurlam elfe , qua ccntrum 

 Solis in diumo fuo inccdcndo dillnntiam b f cx oblcru.v 

 tionc § 3''' pcrcurrit , potcrit hoc modo inclinatio ctiam 

 chordac dcfcdiuac ad diurnum Solis dctcmiinari. In trian- 

 gulo ncmpc rccftangulo q- /? ^/ , ditis latcribis b t/ ^ ct ^ </ , 

 lummis ncmj^c lincarum hf et fd ^ ge ct e d fupra da- 

 .tarum , inucniatur angulus hgd^ ob parallclibmum Hncii- 

 rum A E ct o p , acqualis angulo a o d ^ inchnationi diurni 

 Soh's ad chordam dcfcdiuam ::• K , infcrcndo lc : vt gd 

 fehabct nd dh^ ita finus totus ad liinim anguli d^\h 

 z^doa^ hoc clt ad fmum inclinatiouis chordae dLfc*fli- 

 vae nd diumum Solis quaclitac , quo dato datur cx tabu' 

 iib indinatio cdam ipft. ^iod crat tcrtium ct '■jltimum. 



Schol. !'"'""• fiipporuimiis in nntcccdcntibus idcm 

 puniftum Hnibi Lunnris f (Fig. 2) durantc oblcruatione 

 phafcos nd cnpillos parnllclos tubi omnium vltimum ap- 

 pcllcrc , quod in initio oblcruationis ab iisdcm dircrto 

 capillo op \\d cornua phafcos rcmotilfimum crat , idcm- 

 quc prnccife fcgmcntum dcfcdiuum Lunnc cx obfcruatio- 

 nibiis illi>> dcduci , qucxl initici obfcruationis obtiiicbat ; 

 Id qnod dubium adhuc moucrc nliciii potcrit ; cum diiran- 

 tc oblcruationc phalcos ct magnitudo phnlcos ct pofitio 



cius .' 



