Vitruvius, De architectura libri decem, 1567

Table of handwritten notes

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Nunc ad analemma deſignandum
accedam
.
Eſto circulus meridia-
no
reſpondens a b c d.
in tetrantes ſuos duabus diametris diuidatur a d, æquinoctiali, b c. axi re-
ſpondeat
, ita ut b, ſit ſuperior uertex, qui est ad ar cton.
c, uero inferior, diuidatur tetrans a b, in partes
nonaginta
ab a ſigno, a quo ſeparentur partes uiginti tres, &
dimidia, & in termino ponatur f. ab eodem
quoque
ſeparentur partes uiginti &
minuta duodecim, ubi ponatur o. demum ab eodem puncto a, nume-
3330140[Figure 140]11 ſ x d 11 p k 1 2 1 2 3 4 5f 6 r 11 10 9 8 7 n f m 12 11 10 9 8 7 6 5 1 02 3 4 1g c 1 2 1 2 3 4 5 6 e 11 10 9 8 7 q b o rentur partes undecim, &
dimidia, &
in
fine ponatur k.
transferantur ea-
dem
interualla ab a, inferius ita ut
a
f.
ſit a b. & a o, ſit a q. &
demum
a k, ſit a m.
eædem diui-
ſiones
in oppoſitam partem, ſupra &

infra
d, transſerantur ita ut ipſi f
reſpondeat
g.
ipſi o, reſpondeat p.
ipſi k. l. ipſi m. n. ipſi q. r. &
demum
ipſi b.
i. ducantur ergo li-
neæ
f g.
o p. k l. m n. q r. b
4440 i.
ſunt diametri ſignorum, idest cir-
culorum
æquedistantium ab æquino-
ctiali
ſecundum principiorum ſignorũ
declinationem
, ita ut diameter f g,
ſit
diametros circuli quem Sol facit,
in
Cancrum init.
b i, ad Capricor-
num
referatur.
o p, ad Geminos, &
Leonem
.
k l. ad Taurum, & Virgi-
nem
.
m n, ad Piſces. q r, ad A-
quarium
, &
Sagittarium. Diametro-
5550 rum interualla hæc aut ex tabella de-
clinationis
Solis, aut ex menſtruo cir-
culo
, &
lacotomo linea ex analemma
te
ſumuntur.
Eadem ratione per ſin-
gulos
ſignorum gradus diametros in
analemma
transferre poteris.
Ducan-
tur
ergo ſuper diametros illas hemi-
cyclia
, ne autem linearum confuſio fiat, quatuor tantum diametros ſumemus.
æquinoctialis, Tropici ſuperio-
ris
, &
Tauri, inferius uero Sagittarij, quoniam ratio unius alterius rationem ostendet, ut notum erit. Sint
ergo
centra earum diametrorum collocata, ubi ea ſecant mundi axem, ita e s, centrum erit ſemicirculi in
6660

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