OCR Text |
Show • 6 De MundJ ·Fabrlc~ ~ • : ~ . .. • tio funt veteres macula:, fJciem hmnaoam atiquaten~~ trlelufu:.r emnmreHs u,m c,t'lnls qe m.n lt·n omnibus fuis reuoluc,i onibus temper luna nobis. cb~ertit. De Lt~1J£ /v'l ag~itudine. 1• A 1 0 lunam dfe minorern terra, ~uius_euid e ns_ a rg~1men~n~ dt; . quod in lunaribt~ s eclypflbus , tpfa m vmbra_ tel r~ altquando tand iU u· nmor2. tur ' vt necc ff~ fit diametrum lun~ , · dtamefit rum ·v mbr:·t . · ·b· b. . . ' mets·r1· cum au tern vmbra, vt otlendunus, 1t comca,ent Jni l "IS , t'Cl ~e · . . · . · ibidem vbi lunl perrranflr,dJameter vmbt·a! mt?or dta~erro tcrrcr, qus~ vmbra conica femper g.racilefcjt. vnde o~ceflano _fequttur 1un~ q_uoqt!tl d1amctrum mulco rnincrem dle, quam f1t terra: d1ameter, JC prowde tp~ fam quoque lunam terra eHe minorem. . . . 2. Aio lunam effe lungo ir:tcrual lo ~ole mworem, _cUJus fi.gnum en1~ens funt !olis eclypfes, in qUJbus, qu~mUis Iuna fie multis part~b~s fole tnfe .. rim~, nobifque- propic-r, nihilommus ahq~a o c!o folen n?b1s ~ta ?ccul~a:,. vr eo fe mulw minorem prod at ; nam vcs refert P:AgUillo?ms !~ opttcl_s Jib. 6.anno 15 67, fa eta eft eclyp6s, in qua, qoamuts luna dtrede mrer Vl~ fum, & folem in.terponebatur, non tamen totun: folcm o_bfcurab~t,fed r~ .. Jinquebatur circumguaque de fole circulus q~tda m lucJd~s , qu1lun:r dt· fcum, in coronx modum, circumuerg<:bar. hw~ fane ~ffictrur folem luna maiorem dte; quoniam enim rad1j optict, fiue ltnea! \TJfiu~, qua: ab oculo nofiro producta:, lunare corpus hinc in de tangebant, a!tws vfque ~d fo .. lcm per rn;rgnum jJlud iuterual lum extenfx femper mag1s, 3C _magiS a.fe inuic~: m diuellebantvr , mai!.}S pro feCi~ e!fe opo~;et c~•·pus tl_lud folt~ quod in tanra remotione pr~d i ct ar um lmearum du ~ ant1 a.m ad.tmplebar, quam !1t luna, qua: earumdc m linearum Iongc minor em dtfiantt~m occu.· paba t. Pra:terea, luna ell minor quam terra. T~rra aure ~n ef~ mt?or ~ole, vr pacet ex vmbra cius conic a , quare luna xnulto mag1s eutmmor 1pfa folt!.J •. . 3· H:rcautem Ieui bracl~io Gntdiaa. Vcrum, vtcxa8e Ion~ m~gmtu· dinem oaendamus, earn nimirum .. lfe terr~ plrtem qua.drage fi m :~.m, fiue cam dfe ad terram vt x.ad 40. duo prius funt pr;rcogno{cend<!. Pnmurrw tH diflanri:t ip fi us a terr:t. 2, d f: di;tmccer eius vifibi !is, fiuc appan:ns1 fi. ue ctiam angul1s (ub quo videtur,qua! duo paricer in Cl!terorum fyderu~ ,magnimdine perfcrutanda, praJcire necdfe eric .. qua porro ra no!l~drHamia luna: a terris inuefligetur, iam fupcrius ofienfum eft. Reftat Igitut Vt de eius apparemi diamcrro c.ognofceuda trackmus. Primus modus~tt . re r ooftrum QEad, ancem, l'IJagTJa cur a, afrronomice collocarum. q~~ !' conftituto , p~r foramina, aut rimulas dioptr3:!, collima!ldum efr dll.tge· ter in fupr~n..um lunz limbum,cum ca meridia.num pertranfit;,& fc,a.n~ . . ~~ . . T ertla '7? drs: I 5 i in ioferiorem etiJm Jim bum; arque notanda funt duo loca dioptf~ iri ar; cu ~adrantis ; nam difcantia, fiue arcus OE_adrantis inter ha:c c!uo toea interceptus, eric quantitas apparcntis dtamtrri luna-. iddl,exhib,bit tat rninura, quot lunare corpus in ca:Jo occupat; liuc.e:xhibebic mjnuta anguli, fub quo Iuna videtur. hrec obferuatto accuraratior euadec fi fuerint duo obferuator<s 6mul, qui per duos Q:.:_~drantes colliment, vnus ad fuprriorem, alter ad inferiorem lim bum, oJfferentia enim ~orum erit quz- , 1ita quancitas. ,, modus efi Hipparchi, qui ob jd Dioprram quandam_,, quam ideo Hipparchi appellant, excogirauic, cuius confiruchoncm,& vfum docec Proclns Diadochus in Hyp(Jthes: Afiron. in hunc modum: fit regula inRtxibilis, 4,cubitis long a, vt in .#. igura, A B, in qua ad parrem..... .A, infixit, erexitque orrhogonafirer pinnulam D C,immobilem, in qua:.:; dfct paruum foramt'n D. a Ira am fimiliter E F, pinnulam orrhooonaliter cidem regul~ erexit, fed quz p~r fubfcudem in cana liculo, A B, fnferta.-, furfurf!, ac deorfum man ens perpendicuJis, moueri poffet. in ea fecit duo f~ramma parua E. F. qua: ita :alceri feramini D, refponderent, vt D, me· diUm,e_orum obtinerec,ficuti apparet in figuta. vft s hie erit~cum [olis,aut Juna:~drametrum apparentem accipere hbt:t; confl:ituatur Dioptra ad In· na~' aut folem, quantum fieri pocefi ab horizonte eleuatum, vr fydus fit .pur~ffimurn, & a~ omni refractiooum errore immune. pars -auccm B, fy• der~ orb~e.rcatur, m qua_ ell ~innacidium mobile. _iam per foramen D,ocu-. Ius mlplctens ad fyd~s,t·ta p_1~n~1lam E_ F, v_ltr~,cttroq_ue promoueat,quou_ fque per duo_ foramm_a delptctat lumwans ltmbum luperiorem , & infe~ lore_m_ 6mul}tdeft,radius vnus vifiuus tranfiens per furamina D)E,vidt:'Zt l~feno~em IU":re margincrl}; alre_r radius per foramina D, E, videat fupcrwrem margmem. hac entm racJone Gxtrcma diamerri luna: comprehend~ ntur ab humfmodi radijsJ ficque ab cis angulus, E D F, fub quo eadem. ~Jameterfpedatur , .6ue cuidiam~te.r fubtenditur. hie ergo angul us exp~ ndend~s eft, per propof.2.Appar.quot-enim min uta jJJc contmebir,to· ttd{.~m CtJa ~J1 min towm er.it a pparcns diameter obferuata. hoc codelD...J ~odo,~ D!optra. vre batur ttiam Ptolameus}cap.l4· ib. 5. magna: contt. F~~lunuo~num diametros.capiendas. · · · ,. · " I · - ~odus |