Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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16
THEODOSII
SPHAERICORVM
LIBER
PRIMVS
.
6
[Figure 6]
DEFINIT
IONES
.
I
SPHAERA
eſt
figura
ſolida
compre-
henſa
vna
ſuperficie
,
ad
quam
ab
vno
eorum
punctorum
,
quæ
intra
figuram
ſunt
,
omnes
rectæ
lineæ
ductæ
ſunt
in-
ter
ſe
æquales
.
II
.
Centrum
autem
Sphæræ
,
eſt
eiuſmodi
punctũ
.
III
.
Axis
verò
Sphæræ
,
eſt
recta
quædã
linea
per
cen
trũ
ducta
, &
vtrin
que
terminata
in
ſphæræ
ſuper-
ficie
,
circa
quã
quieſcentẽ
circumuoluitur
ſphęra
.
IIII
.
Poli
ſphæræ
ſunt
extrema
puncta
ipſius
axis
.
V
.
Polus
Circuli
in
Sphæra
,
eſt
punctum
in
ſuper-
ficie
ſphæræ
,
à
quo
omnes
rectæ
lineæ
ad
Circuli
circumferentiam
tendentes
ſuntinter
ſe
æquales
.
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