Julian calendar

Julian calendar
Ju‧li‧an cal‧en‧dar, the /ˌdʒuːliən ˈkæləndəʳ/
the calendar introduced by Julius Caesar in Rome in 46 BC, that fixed the normal year at 365 days. The Gregorian calendar, the usual calendar used in western countries in modern times, is based on the Julian calendar.

Ju·lian cal·en·darBrE /ˌdʒuːliən ˈkælɪndə(r)/ 🔊NAmE /ˌdʒuːliən ˈkælɪndər/ 🔊 noun [singular] the system of arranging days and months in the year introduced by Julius Caesar, and used in Western countries until the Gregorian calendar replaced it 儒略历（凯撒大帝制订的历法，在西方国家一直使用至以格里历取代为止）