34 De su ccessiva mutatione 



enim ambo fere sqnalia. Cujufmodi autem phcrno- 

 mena hinc oriaucur, opera precium eric accuratiffime 

 definire. 



XLIV. 



Fig. i. 5j c jgj tur j n cce [ q c via comets ex fole vifa & 

 Q sG: Sj ecliptics iitus ante cometa; adventum, erit ex 

 dementis orbits cometa; angukis Q^C= iy° 56' = a 

 £c arcus Q — — 57 , 16'. Jam per punctum ^ tranfeat 

 squator yE i () tit (it angukis ./E :£= S = 230, 2#I'. 

 Ac poftquam comets effect um fuum produxit , fie 

 t o \ a ecliptica fecans priori in 0, erit Q a> = d-L , 

 6c Cao = a-h d a>. Ducatur arculus a> u ad Q nor- 

 malis, eric Qu = d-^coJ.a 5c a u = d-^Jin. a. Hinc 

 ob dai = d\ reperitur arcus Q 0= 1707', & angu- 

 lus minimus ad 0=50777.", ob (/-s{/ = </a) = 47 ^777". 

 Cum ergo fit =0=0 = — 34 , 9' eclipcica mom aggra- 

 torio circa punctum o, quod cadic in "14°, 5/ con- 

 verfa eft angulo 50 m" ficqtic punctum folftitiale s> 

 magis ab squatore removctur & obliquitas ecliptica: 

 augetnr. Ac fi obliquitas ecliptics augetur. Ac fi 

 obliquitas ecliptics priftina ponatur == e. Prefens = $ 

 -+-dt, in venicur dt = 4 1 ttz" & cum fit /* A = — 63 m". 

 Puncta squinoccialia fuper ecliptica promota erunt fpa- 

 tio 63 m" fuper squatore autem fpatio 70" m. In lati- 

 tudine igitur ftellarnm fixarnm hie effectus potiflimum 

 fpeclabitur, & maxime quidem in iis quarum longitudo 

 eft vel .0 4°,*)', vel ^ 4 , 9', quarum ills ad polum 

 ecliptics borealem acceffifTe, hs vero ab eo recefliffe 

 videbuntur intervalio 50/72". 



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