Full text: de Sacrobosco, Johannes: Sphaera Ioannis de Sacro Bosco emendata


DE SACRO BOSCO, CAP. 3. conſiderentur dies naturales, il li de nece ßitate
erunt inæquales. I n ſphærarecta , propter vni-
cam cauſam, ſcilicet propter obliquitatem zo-

diaci: in ſphæra verò obliqua, propter duas cau-
ſ{as}, ſcilicet propter obliquitatem zodiaci, & ob-
liquitatem horizontis obliqui. Tertia ſolet aßi-
gnari cauſa, eccentricitas circuli Solis.

44.1.

B A

45. SCHOLION VINETI.

Plini{us} libro ſecundo, inæqualitatis dierum vnicam tradit
cauſam, obliquitatem zodiaci: Ptolemæ{us} in fine libri tertij ma-
gnæ Syntax. du{as}: vnam, eandem obliquitatem zodiaci: alte-
ram, orbis Solis eccentricitatem. Hîc addit tertiam cauſam, ho-
rizontis obliquitatem: quam tamen oſtendit Baptiſta Capua-
n{us} nihil ſolam ſolã poſſe, ſed tantùm ea zodiaci adiuuari obliquita- tem obliquita-tẽ. De orbis Solis eccentricitate eccẽtricitate cap. quarto, in quo orbe cùm Sol a-
qualiter verſetur, atque ita ſub zodiaco inæqualiter, æqualib{us}
temporis ſpatiis inæquales ecliptici circuli partes percurrens: dies,
quos vocant, naturales, & ſic quoque inæquales eſſe neceſſe est.

Notandum etiam, quòd Sol tendens à primo

puncto pũcto Capricorni per Arietem, vſque vſq; ad primum
punctum punctũ Cancri, raptu firmamenti deſcribit 128 .
parallelos : qui quidem paralleli, etſi non omnino
ſint circuli, ſed ſpiræ, cùm tamen non ſit in hoc
error ſenſibilis, in hoc vis non conſtituatur cõſtituatur, ſi cir-
culi appellentur , de numero quorum circulorum
ſunt duo tropic [?] i, & vnus æquinoctialis. Item
iam dictos circulos deſcribit Sol raptu firma-

menti deſcendens à primo puncto Cancri per

Libram, vſque ad primum punctum Capri-
corni: & iſti circuli dierum naturalium circuli

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