Benedetti, Giovanni Battista de, Io. Baptistae Benedicti ... Diversarvm specvlationvm mathematicarum, et physicarum liber : quarum seriem sequens pagina indicabit ; [annotated and critiqued by Guidobaldo Del Monte]

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Quapropter mirandum non eſt eos, qui margaritas quærunt in fundo maris nul-
lum
ibi videre lumen.
Nihilominus vmbra maris, quam dico nos poſſe videre in
ſuperficie
corporis lunaris, ab alia etiam ratione prouenire poſſet.
Imaginemur enim
aggregatum
terrę, marisque; eſſe tantummodò aqueum, quod quidem eſſet perfectè
ſphæricum
ratione centri grauitatis, ſupponamusque; ipsum eſſe valde diaphanum, ita
quod
radij ſolares ipſum penetraſſent.
Tunc dico quod in ſuperficie corporis luna-
ris
produceret vmbram.
Pro cuius intelligentia cogitemus ſubſcriptam hic figuram
b.h.q.a.e. eſſe ſphęram aliquam cryſtallinam, & ad partem .b.h.q. ſit radius lumino-
ſus
ſolaris qui ipſam illuminet, cuius radij extremitates ſint .d.b.l. et .p.q.r. ſupponen-
do
.d.l. et .p.r. terminos eſſe vnius plani ſecantis ipſum radium per axem,
tunc vide-
bis
ipſum radium .b.p.q.d. tranſeun-
tem
392[Figure 392] tranſeun-
tem
ipſam ſphæram, congregari ſeu
condenſari, ob vniformem refractio-
nem
, vſque ad punctum .o. deinde;
propter
rectitudinem ipſius diffu-
ſionis
, vltra punctum .o. ipſum dila-
tari
, diſgregari, ſeu rarefieri, quouſque;
nullius
illuminationis actum habeat .
vt
: exempli gratia .o.t. et .o.s. eius par
tes
, ita quod interualla .c.o.b. et .u.
393[Figure 393] o.q. relinquerentur priuata lumini-
bus
, vnde vmbroſa remanerent. di-
ſtantiaque; ab .o. ad ſuperficiem ſphęri
cam
corporis .b.e.d.q. non ſolum non
maior
eſt diametro ipſius ſphæræ;
imo minor, vt à te ipſo experiri po-
tes
.
Poſito igitur aliquo obiecto
opaco
in loco .K.o.g. eius ſuperficies
intercepta
inter .K. et .g. adumbrata
erit
, excepto puncto .o.
Poſito dein
de
ipſo obiecto in loco .n.y.x.m. eius
partes
.y.n. et .x.m. remanebunt lu-

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