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

144. DE ÆTATE
LVNAE INVENIEN-

da & Cyclo Decennouen-
nali.

AD habendam autem Aetatem Lunæ ſin-
gulis A nnis, hoc est, tempus receßionis eius à
Sole,
P rimo inueniebantur T abulæ à R omanis, D ein-
de
C haldæi A ureum numerum inuenerunt, & R o-
mam miſerunt.
R omani igitur numerum illum pro-
pter eius facilitatem & utilitatem, in
C alendarijs
A ureis literis ſcripſerunt, unde adhuc A ureus ap-
pellatur numerus.
I n primo igitur anno C ycli D e-
cennouennalis, per totum annum primationes
L unæ
per unitatem notantur, in ſecundo per 2, & ita dein
ceps.
  T ranſiens igitur à D ecembri in I anuarium,
tranſibit ab unitate in 2 ponendo binarium ſuper
E
literam, pridie I dus I anuarij.   Similiter uariabitur
ordo in cæteris annis,
V nde cum C yclus iste concine-
at 19
A nnos, inter numeros prædictos 19 maximus
erit.

P onitur ergo in prima die I anuarij 3. quoniam

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