Century leap year - wikipedia, In the gregorian calendar every year that is divisible by 400 is due to be an end-of-century leap year (often called a century leap year), with the intercalation of. Calendar converter - fourmilab, The gregorian calendar was proclaimed by pope gregory xiii and took effect in most catholic states in 1582, in which october 4, 1582 of the julian calendar was. The julian gregorian calendars - hermetic systems, The julian calendar, the gregorian reform and its adoption, astronomical year numbering, the julian and the gregorian proleptic calendars, and the accuracy of calendars..
The julian calendar - tondering, What julian calendar? julian calendar introduced julius caesar 45 bc. common late 1500s, countries started changing. http://www.tondering.dk/claus/cal/julian.php From julian gregorian calendar, Change julian gregorian calendar. gregorian calendar introduced 1582, 300 years countries . http://www.timeanddate.com/calendar/julian-gregorian-switch.html Leap year - wikipedia, A leap year ( intercalary year bissextile year) calendar year additional day (, case lunisolar calendars, month. https://en.wikipedia.org/wiki/Leap_year