A VIRIB. COELEST. PRODVCT. 223 



vnde colligitur : 



Pfin. A -t-Qcof. X:=:fin./>fin. (q- \|/) 



Qfin.X— Pcof. X ~ fin. p ( — cof mcof. (q— vj/ ) -f- tang. g 



fin.wfin. (q— w)). 



Hinc totum calculum fatis expedite abfoluere lice- 

 bk; valor tantum anguli X moram faceflere vide- 

 tur , ob terminum ~" ( ?_ Hg j/ ra ' > 1 - , quantitatem mini- 

 mam n in denominatore inuoluentem ; quae fi eua- 

 nefceret , hic terminus adeo in infinitum excrefce- 

 ret. Qiiod cum in motu terrae eueniat , manifeftum 

 eft hanc appropinquandi rationem noftro cafu locum 

 habere non poffe ex quo aliam methodum ingredi 

 conueniet , quam nunc accuratius fum expofituru^s* 



Alia methodus fbrmulas inuentas euol- 



vendi, ad motum vertiginis terrae 



magis accommodata. 



XXVIII. Refumamus noftras fbrmulas pro 

 motu vertiginis fupra expofitas : 



l0 - S? + a/*-3aVcof.<coC^=ro 



a°. fi-a/j+SaVcof^cof-vjzro 

 3°. dl=:-dt(y{\n.<p-\-zco(.<p) 

 4°. d$z=fdt-^ :i (yco<.<$>-z{m.$) 

 5°. d^z= j|f r (jcof.$-*fin.(J)) 



vbi 



