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https://www.timeanddate.com/calendar/julian-calendar.html
The Julian Calendar
The Julian calendar reformed the ancient Roman calendar and consists of three cycles of 365-day years followed by a 366-day leap year.
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https://en.wikipedia.org/wiki/Julian_calendar
Julian calendar - Wikipedia
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https://www.typecalendar.com/julian-date
Julian Calendar 2026: Today's Julian Date Converter
Dec 13, 2025 - Get today’s Julian date (UTC) and convert any calendar date/time to JD, JDN, MJD and day-of-year (YYDDD). Instant results, reverse conversion, copy buttons.
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https://www.timeanddate.com/calendar/julian-gregorian-switch.html
Julian to Gregorian Calendar: How We Lost 10 Days
The Gregorian calendar was introduced in 1582 in some countries. The US, Canada, and the UK changed in 1752. Why were some days skipped?
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