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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Vnde quotieſcunque volueris in aliquo plano, orizonti parallelo, lineas hora-
rias
ducere, iudico optimum fore ſi ſeparatim deſignatæ fuerint tres figuræ, hoc
eſt
analemma meridianum, vel azimutale, vt ita dicam,
deinde parallelus inſeruiens
pro
tropicis, vt ego feci cap .51. meæ gnomonicæ, quæ duæ figuræ, ſufficientes erunt
pro
omnibus horologijs, tam ori-
358[Figure 358] zontalibus quam muralibus, non
tamen
omninò, ideo pro orizon-
talibus
, tertiam figuram ſeparatam
deſignaui
, quę erit circulus .H.I.
K
.
eiuſdem magnitudinis cum ana-
lemmate
, in quo, ductis duobus
dia
metris inuicom ad rectos, quo-
rum
vnus .H.I. ſignificet orizon-
talem
lineam, reliqua verò ver-
ticalem
, ducatur poſtea .s.a. tam di-
ſtans
ab .H.I. quanta eſt longitudo
gnomonis
horologij orizontalis,
cogitemus
,
deinde hunc circulum
communem
eſſe omnibus azimut
necnon
plano horologij, in cuius
circunferentia
à puncto .k. nadir ip-
ſius
zenit, accipiantur arcus æqua-
les
ijs ipſorum azimut, quos termi-
nat
zenit, & ipſi almicantarat, vt
exempli
gratia, accipiemus arcum
k.L. æqualem arcui .L.z. ipſius ana-
lemmatis
, ducta poſtea linea occul
ta
.o.L. ſignabimus azimutalem .s.a.
in
puncto .a. vbi duæ lineæ ſein
uicem
ſecant, & ſic habebimus iu-
ſtam
quantitatem ipſius vmbræ gno
monis
.s.o. tali hora,
deinde in ori-
zontali
.H.I. ſumatur .o.r. à centro .
o
.
ęqualis ei quę in analemate repe
ritur
, quæ vna portio eſt commu-
nis
ſectionis meridiani cum almi-
cantarat
, terminata ab axe orizon
tis
, & à diametro paralleli.
Deinde

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