Post idus, quas quisque suas habet ordine mensis, diversae numero redeunt variante kalendae, dum [vertente anno] rursumque iterumque vocantur, ut tandem optati procedant temporis ortu.
After the middle of the month, which varies in each month, the first day of the month returns with a changing number. As the year goes on, the Calends are called back again and again until they finally arrive at the desired season.