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


cum toto cœlo Sol circa terram ſemel conuertitur,
Sicut temporalis hora cuiuſq; diei aut noctis duo-
decima pars intelligitur, olim quàm nũc uſitatior.

240. LXXIX.

Semper autẽ umbræ certa ac perpetua lege al
titudini Solis reſpondẽt, ſic, ut altiore Sole gnomõ
minorem umbram iaciat, et humiliore prolixiorẽ.

241. LXXX.

V nde ſequitur, meridianas umbras, cuiuſq; diei
eſſe breuißimas, Sicut matutinas & ueſpertinas cõ
tra lõgißimas, quia antemeridianæ minuuntur, ſi-
cut pomeridianæ rurſus accreſcũt.
D eniq; æſtate
ſingulis horis breuiores ſunt umbræ, quam in hye-
me.

242. LXXXI.

N ec tantum diei partes diſcernũt umbræ, ſed
ad hunc quoq; uſum perinent, ut Solis altitudinẽ
ſupra horizontẽ quolibet diei tempore liceat inde
ratiocinari.

243. LXXXII.

H uius autẽ ratiocinij R egula eſt, quod umbra
par eſt gnomoni, quando Solis altitudo æquat 45
partes circuli, ſeu cum Sol medium locũ inter uer
ticem & finitorem poßidet, minor autem umbra
gnomone, cum Sol proprior uertici eſt, quã finito-

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