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XI.—Principal Days of the Mahommedan Calendar.

XII.—Epochs, Eras, and Periods.

For the Revolutionary Calendar see ad fin.

The principal works on the calendar are the following:—Clavius, ''Romani Calendarii a Gregorio XIII. P.M. restituti Explicatio'' (Rome, 1603); L’Art de vérifier les dates; Lalande, Astronomie, tome ii.; Traité de la sphère et du calendrier, par M. Revard (Paris, 1816); Delambre, Traité de l’astronomie théorique et pratique, tome iii.; Histoire de l’astronomie moderne; Methodus technica brevis, perfacilis, ac perpetua construendi Calendarium Ecclesiasticum, Stylo tam novo quam vetere, pro cunctis Christianis Europae populis, &c., auctore Paulo Tittel (Göttingen, 1816); Formole analitiche pel