+58 METHODJS OBSERrAXDl 



mileqiic triangnliim rcfoliumir , determinibitiir inde diffe- 

 rcntia dcclin.uionum V M ct afccnfionum recl.uum L M 

 Lunac ct vmbnic tcmporc oblcru.uionis a(lumpt:ie obti- 

 nentcs pnrtibus circuli maximi cxprcfl^ie \ quanim prima 

 immcdiate vera ex rerolutione hac prodibit , altcra vcro 

 in partCb circuli parallcli rcduccnda erit pcr wum S'"'" §9"' , 

 antcquam pro vcra habcatur. Datis autcm hoc modo 

 diffcrcntiis Doclinationum et afccnfionum rcdarum ccntri 

 Lunae a centio vmbrae; ct ex requifitis §phi huius dccli* 

 natione et afccnfione rc(fla ccntri Lunae , declinatio ctiam 

 et alcenfio recfla ccntri vmbrae per fe innotclccut. Qiiodfi 

 autcm ad haec ex theoria SoUs ad tcinpns oblcruationis 

 phafeos afccnfio rccfta Sohs ct dcprcllio ciusdcm infra ho- 

 rizontcm dcntur, d.ibitur indc 4'" ad idcm tcmpus paral- 

 laxis etiam ccntri vmbrac in dilco Lunari conlpicuac , 

 idque duplici methodo ; prima ucmpc , li a dcprcliionc 

 Solis infhi horizontcm altitudo ccntri vmbrac apparcns 

 fupra mo 3'-" inucnta fubtrahatur ; lccunda autcm , (i dirti;- 

 rcntia afccnfionis rcdac ccntri vmbrac , ab alccnlionc rc- 

 ifta pun(fli ccntro Sohs oppoliti inucniatur , cx comple 

 mcntisquc altitudinis fupra hori/ontcm , ct dcclinationis 

 ccntri vmbrac fupra iuucntarum , ncc non altitudinis po- 

 li , anguhis ad ccntrum vmbrac , qucin circuhis dcciina- 

 tionis pcr ccntrum vmbrac tranlicns cum circulo altitudi- 

 flg. 1«, "'^ P^"^ *'^^f" centrum tranlcnnte ficit , dctcrminctur ; his 

 cnim cum complcmcnto dcchuationis apparcutis vmbrae 

 cognitis paraliaxis quoquc ccntri vmbrac , il-u dilfcrcntia 

 altitudinum ciusdcm fupra hori/ontcm vcrac tt vilac da- 

 bitur. Keprclcntct cnim circulub ZPllO nicridiauum , 



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