Biancani, Giuseppe, Aristotelis loca mathematica, 1615

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164[Figure 64]
Quare minor erit ſuperior ſectio ſemicir­
culo, in qua S T, (nam Q S T, ſemicir­
culus est, nunc autem interſectus eſt ab
horizonte A C; itaque Q S, diſparens erit)
eleuato ipſo Sole) demonſtrat propoſi­
tionem ſecundam nimirum Sole ſupra
horizontem
eleuato, ambitum Iridis
eſſe minorem circuli portionem, ſiue
ſemicirculo minorem.
ſit igitur in fi­
gura ſuperiori, quam textui congruen­
tem
reſtituimus, linea A C, horizon­
talis, ſupra quam Sol ſit eleuatus in
circulo altitudinis in loco G, axis au­
rem coni, quem reflexè faciunt ſit
G K ω P. alia igitur omnia, quæ ſupra exiſtente in ortu aſtro oſtenſa ſunt, hic
pariter oſtendi poſſunt, ſcilicet Iridem fieri tantum per lineas proportiona­
les, & æquales lineis G M, M K, quia Iris videri nequit, niſi in tali, ac deter­
minata reflexione, & angulo, vt initio ſuppoſui; & quia lineæ illis propor­
tionales non poſſunt alibi conſtitui, quam in ambitu circulari, & in diuerſis
planis, ſequitur, vt ſupra Iridem eſſe circularem M N L; eiusque; polum P, &
centrum ω, inueniemus ſimiliter in axe G K ω P, & quia axis hic ſecat hori­
zontem in K, in hac vltima figura propter eleuationem Solis ſupra A C, in
G, ſequitur partem axis, in qua ω, & P, exiſtunt, infra horizontem deprimi.
& quia (vt pater ex 64. 10. Vitell.) & P, polus, & centrum ω, Iridis, & cen­
trum
K, circuli horizontis, cuius ſcilicet diameter eſſet A K S, & Sol, ſunt
in eadem linea G K ω P, ſi centrum Iridis ω, ſit infra horizontem, patet mi­
norem circuli portionem, quam ſit ſemicirculus ſupra horizontem eminere,
in qua poſui literas S L T, nam Q S L T R, eſt ſemicirculus, cuius pars con­
tenta inter duos arcus Q S, & T R, eſt infra horizontem.
debemus autem
hunc ſemicirculum, & hanc portionem ipſius S L T, extantem ſupra hori­
zontem imaginari erectam eſſe, vt planum ipſius circuli faciat angulos re­
ctos ſiue ſit perpendiculare cum axe G K P; & circulum altitudinis A G M N,
modo fungi vice horizontis.
ſic enim ſola portio S L T, appareret nobis, eſ­
ſetque
; rationabiliter conſtituta.
Ex quibus 2. Ariſt. propoſitio manifeſta eſt.
180

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