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triciorum & paedagogorum vestigiisinsistendo, duarum, qvae circa astraversantur, scientiarum alteram nulloin pretio habeo, utqve deceptricemac fallacem intutamqve aversor:qvatenus qvae in mundo mutationesaccidunt, ab astrorum positu & con-figuratione immitti asserunt , qvieam praecipue jactant, ac maximocum periculo profitentur. Ordinevero & facultate primam , primasenim partes haec adversus alias sibivindicat, utilissimam ac maximeconducibilem, in astrorum motibusrimandis solummodo versantemplurimi faciens, in primo hujus ope-ris libro , ut Theoriae explicationem& in illam commentarium,tam mei,qvam hortatorum mihi ab anuqvofamiliarium causa faciliorem exhi-berem, calculi absolvendi isagogenpraemittere, & compendiose decla-rare decrevi, qvae ad ea, qvae secundoac tertio libro continentur , perci-pienda valde conducat, Qvo decalculo in diffusioribus amplioribus-qve commentariisPhilosophus Syria*nus, Theon & Pappus, & Johannes Gram •matiem civis Alexandrin 9 tractarunt;cui calculi subducendi methodo änobis reperta qvaedam adjecta sunt.In fecundo vero libro calculi in Plane-tis ac fixis instituendi Magnae con-structionis modum planiori metho-do tractare exemplisqve facilioremreddere ; simul«|ve numerandi ra-tiones