Julian day calendar, Regular years: (2001-2003, 2005-2007, 2009-2011, 2013-2015). Computus - wikipedia, Computus (latin for "computation") is a calculation that determines the calendar date of easter. because the date is based on a calendar-dependent equinox rather than. Calendar converter, 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.

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