Julian date (jd) calculator calendars | aavso.org, This application assumes use of the gregorian calendar and only works correctly for dates on or after october 15, 1582. for more on julian dates, click here.. 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 - 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.

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