After fresh trouble with the clergy, he returned to Paris and published a defence of his theories in a work entitled Ides sur la politique de Platon et d'Aristole.
Ides, counting inclusively.
Instead of distinguishing the days by the ordinal numbers first,, second, third, &c., the Romans counted backwards from three fixed epochs, namely, the Calends, the Nones and the Ides.
Special sacrifices were offered on the kalends, nones, and ides of every month, and on the occasion of important family events.
In the months of March, May, July and October, the Ides fell on the 5th day, and the Nones consequently on the 7th; so that each of these months had six days named from the Nones.