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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437425EPISTOL AE. bus linearum, meridianę, & verticalis, vt acu mediante volui poſſit, prout oportebit.
Perfectum igitur cum fuerit op us hoc, te oportet ſcire modum ipſo vtendi. Qua-
propter
quotieſcunque volueris, aſpice Solis locum in Zodiaco, Ephemeridibus me
diantibus
, idem dico de vnoquoque reliquorum planetarum.
Inuento poſtea So-
lis
loco in noſtro Zodiaco horologij, manu mediante, volue oſtenſorem, ita, vt li-
nea
fiduciæ tranſeat per gradum Solis, deinde, claui ipſius horologij mediante, vol-
ue
indicem, ita cum Zodiaco coniunctum, vt linea fiducię, punctum, ſeu partem ho-
oſtendat in limbo horologii, quę quidem hora notanda eſt ſi fuerit ex ijs quę in-
cipiunt
à meridie vſque ad mediam noctem, vel à media nocte vſque ad meri-
diem
,
tunc acu ſupradicta mediante, poſita in aliquo illorum quatuor foraminum,
circunuoluenda
eſt Tabula, ita, vt extremitas lineę meridianę ſupra orizontem, ex
ęquo
incidat inter duodecimam horam, & lineam fiducię, computum incipiendo à
duodecima
hora, ſi vero dicta indicis hora fuerit ex ijs quę incipiunt à media nocte &
deſinunt
poſtea in meridie, oportebit, acu mediante, circunuoluere Tabulam, quo-
uſque
punctum extremum meridianæ ſub terra, medio loco exiſtat inter duodecimam
horam
, & horam oſtenſam à linea fiducię.
Quo facto continuo videbis erectam cae-
li
figuram.
& quia vidiſti loca planetarum in Ephemeridibus, videbis etiam
eorum
loca accidentalia in domibus ſcilicetaccidentalibus, ſi aliquas fixarum in
Aranea
deſiderabis, accipere poteris Ocu. , cor. , ſpi. , Liram, Aquilam, &
Arcturum
, dum locus fuerit capax.
Nec te moueat, quod oportebit lineam fiducię
ſupra
gra. Solis quotidie collocare, quod nihil refert.
Nam oportet etiam quoti-
die
cordam fuſo circunuoluere.
Fullustriſſ .D. Volfardo Aiſeſtain.

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