Full text: de Sacrobosco, Johannes: Iohannis de Sacro Bvsto Libellvs de Sphaera : accessit eivsdem avtoris compvtvs ecclesiasticus, et alia quaedam, in studiosorum gratiam edita


ſtellarum fixarum, ſcilicet in 100 annis gradu uno.
E x his ita\'q; duobus motibus, colligitur curſus eius in
circulo ſignorum ab occidente in orientem, per quem
abſcindit circulum ſignorum in 365 diebus, & quar
ta unius diei, præter rem modicam, quæ nullius est
ſenſibilitatis.

Q uilibet autem P laneta, præter Solem, tres ha-
bet circulos, ſcilicet æquantem, deferentem & e-
picyclum.

[figure]

Æ quans quidem L unæ, eſt circulus concentricus
cum terra, & eſt in ſuperficie eclipticæ,
E ius uero
deferens eſt circulus eccentricus, nec eſt in ſuperfi-
cie eclipticæ, imò una eius medietas declinat uerſus
ſeptentrionem altera uerſus auſtrum.
  E t D eferens
interſecat æquantem in duobus locis.
E t figura inter
ſectionis appellatur draco, quoniam lata est in me-

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