Gregory XIII

“ Again, so that the fourteenth day of the paschal moon may be correctly found, and that the age of the moon may be truly announced to the faithful every day from the martyrology, according to the ancient custom of the Church, we decree:
that the golden number is to be removed from the calendar and in its place is to be substituted a cycle of epacts, regulated (as we have said) by a certain rule of the golden number, to make sure that the new moon and the paschal fourteenth day of the moon will always retain their true places. ”

“ When these experts had applied themselves to the matter with much time, diligence and study into the night, and had searched out cycles, both ancient and modern, from all sources, and discussed them and most carefully evaluated them, they chose, by their own judgment and that of learned men who wrote about the matter, in preference to other things, this cycle of epacts, to which they have also added some things which are seen after careful circumspection to be needed for perfecting the calendar. ”

“ It is therefore entirely forbidden to any man to infringe these our precepts and decrees, mandates, statutes, will, approval, prohibition, sublation, abolition, exhortation and request, or to dare to bear witness or proceed against them. ”