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# Title: [Francisci Vietae Opera Mathematica] Francisci Vietæ Opera Mathematica (shelfmark Leibn. Marg. 101)
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V E R L G R E C O K L A N
PROPOSLTIO XXV.
In Ralendario GFedOtrAno, ita ordinacus est curtus Lunae, ut circula-
cionibus Kalendarii decem ee norem compleat Luna menles Politicos
235, qui Astronomicis bene contentiunt.
Exponantur enim e Kalendario Gregoriano eriginca characteres, quos adscileunt eri-
sinta dies, cujustibee mensis constimei pleni. Lidem ordine rerrogrado numerati ordi-
mencur undeni, icaque characterem lcharacter C diebus undecim aBECVCTFAE, _C Ca CON-
tinua seric. Adsumarur aurem quiliber iplorum, urpoce l, in quo Luna consistat nova,
e a puncto. L eyclum anni ica percurrar Luna, ur desinar lua circuicio in characterem C.
e d charactere C in characterem c, qui ordo contimrabitur decies octies, cyclo vero
decimo nono redibit Luna ad iplum characterem l, ex propolito Epactarum erclo, ad
durei numeri normam directo. Dico igieur ea lua circulatione ablumi annos Lunaces
decem de novem, et praecerea menles P’oliticosplenos sex de unum cavum. Ouoniam
menles Polirici pleni dierum sunc 30, d cari dierum 29; annus aurem Lunaris sex plenis
ee sex cavis rapam aE: e ideo diebu5 354. Cyclus porro anni communis est dicrum 365.
quor constar Kalendarium. Scacuatue Ndies anni primus, M secundus, ac denique qy
tricelimus. Cum isitur abs l Luna pervenerit ad C periplum N, ablumeneur dic5 354.
Nam 2b lad Enem anni numeraneur dics 3 46, guibus ad duneur dies octo. Ouareis esto
annus Lunaris primus. A puncto C ad punctum c ablumencur dies 384. Nam à pun-
eto C ad sinem anni numerantur dics ;57, quibus adduncur 27. Ouare is esto annus
Lunaris secundus e praecerea mensis plenus, ac denique ea numeratio continuetur.
7 338 349 360 341 352 363 344
SIM- SExTUS
fus pluS annuS.
Sepei
Oc
+ 384 354 354 384 354 354 384 354
ic
mus. plus
pleno
ttt
e
355
10a
Decimi
olus met
Atc
333 350 361 342 353 304
3)4 354 384 354 354 383
Deci- Deci. Deci-
Ellat. quin.
llu
Oeci. Deci- Deci
muS
uS O-
mus
sexcus sepri. cavus. nonus
Dlus
pse
poro
nus
monc
Cavo.
Landem isicur redibic Luna ad punctum l. post absolurosannos ee men.
SeS expOSEOS. Decem aurem de novem anni Lunares, Polirico calculo, con-
ILanC BIEHMDAS 228 plenis ec cavis alterne, quibus cum adduntur lex menles
Pleni et unus cavus, summa mensium FIF 235. qui coridem AAconomicis, in an-
norum 19 lulianorum Gregorianorumre interrallo, bene consenciunt. Ne-
que vero alicer erenisser, si ab alio quam l puncto, instirura Fuisset numerario.
In Kalendario igitur Gregoriano, ita ordinatus est curlus Lunx, ur circulatio
nibus Kalendarii decem de norem Luna complearmenses Politicos 235, qui
cocidem Astronomicis bene consentiune. Quoderar ostendendum.
 3447 33
354 354
vnde Duc
ineu
leci
384
uI
cerrius
nense
un
DUS muS
15. IUS.