Full text: de Sacrobosco, Johannes: Sphaera Ioannis de Sacrobosco

COMPVTVS pr{in}cipio Luna est, & dicitur prima. Similiter fa-
ciendum est {in}. 4. Cyclis ſequentib{us}, & de{in}ceps. Sic igitur {in} quatuor Cyclis omnia ad concordiam
reducuntur. Vnde istud temporis ſpatium Cycl{us}
Cyclorum appellatur.

In cui{us} autem quoto Cyclo ſim{us}, ſic ſcitur,
Numer{us} annorum Cycli decennouennalis decennouẽnalis, à biſextili
proximo quouis ord{in}e, vſque vſ {in} finem eiuſdem per. 4. diuidatur, & ſi remanſerit ternari{us}, ſum{us} {in} pri-
mo Cyclo: ſi b{in}ari{us}, {in} ſecundo: ſi vnit{as}, ſum{us} {in}
tertio: ſi autem nihil, ſum{us} {in} vltimo.

72. DE FESTIS MOBI-
LIBVS .

FESTA autem mobilia cùm ex lunationis
diſcretione habeantur, ord{in}is ratione conſe-
quenter de eis est pertractandum. Eſt igitur
Festum mobile, quod penes aſcenſum vel deſcenſum
lunationis celebratur, nullum ſibi locum {in} Calenda-
rio habens aßignatum. Sunt quidem. 5. festa mobi-
lia, ſcilicet, Septuageſima, Quadrageſima, & Paſcha,
Rogationes, & Pentecoſte.

DICITVR autem Septuageſima, à. 70. quaſi
continens. 70. dies. Incipit enim à Dominica qua ca

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