monumenta.ch > Theodulfus Aurelianensis > sectio 11 > bnf10439.175 r > sectio 5 > bsbBSB-InkG-296GW11398.215 > sectio 127 > bsbClm4541.533 > sectio 88 > sectio 2 > sectio 119 > sectio 30 > sectio 55 > sectio 47 > sectio 187 > sectio 39 > bavPal.lat.281.536 > sectio 67 > sectio 84 > sectio 70 > sectio 111 > sectio 6 > bbbCod.120.I.7v > sectio 1 > sectio 17 > bnf10291.201 > sectio 132 > uwbM.p.th.f.68.257 > sectio 3 > sectio 25 > csg51.196 > Alcuinus, Epistolae, 112 > csg48.295 > sectio 9 > csg75.229 > sectio 25 > csg46.101 > sectio 49 > bnf17226.127 > sectio 27 > csg85.189 > sectio 11 > sectio 11 > hlw17.275 > sectio 42 > sectio 31 > sectio 10 > sectio 18 > sectio 48 > bnf6796A.100 > uwbM.p.th.f.12.57 > bnf10439.178 r > sectio 68 > sectio 131 > csg85.201 > sectio 111 > sectio 120 > bnf9389.262 > sectio 17 > bnf5512.141 > sectio 36 > bavPal.lat.311.406 > bnf6796A.101

Beda Venerabilis Beda Venerabilis, De Temporum Ratione, 22, 17
Si vis scire quota est luna VII Idus Decembres, dicito: December in Idus CCCXLVII; tolle VII, Idus remanent CCCXL; adde IX, fiunt CCCXLIX; partire per LIX, quinquagies novies quini CCXCV; tolle CCXCV, remanent LIIII; tolle XXX, remanent XXIIII; vicesima quarta est luna die memorato. Iuvat huiusce argumenti usum, si calculator ultima quinquagesimae nonae partis diligentius memoriae commendat: quinquagies novies seni CCCLIIII, quinquagies novies quini CCXCV, quinquagies novies quaterni CCXXXVI, quinquagies novies terni CLXXVII, quinquagies novies bini CXVIII, quinquies novies assis IX. Eodem ordine diem septimanae quocunque volueris tempore adiuncto Calendarum Ianuariarum die requiris.

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