Converts between calendar and Julian dates ... Julian dates (abbreviated JD) are simply a continuous count of days and fractions since noon Universal Time on January 1, 4713 BCE (on the Julian calendar). Almost 2.5 million days have transpired since this date.
aa.usno.navy.mil/data/docs/JulianDate.php aa.usno.navy.mil/data/docs/JulianDate.php
Julian calendar - Wikipedia, the free encyclopedia
The Julian calendar , a reform of the Roman calendar, was introduced by Julius Caesar in 46 BC, and came into force in 45 BC (709 ab urbe condita ). It was chosen after consultation with the astro...
en.wikipedia.org/wiki/Julian_calendar
Julian calendar n. The solar calendar introduced by Julius Caesar in Rome in 46 B.C. , having a year of 12 months and 365 days and a leap year of 366 ... Dictionary: Julian calendar...
www.answers.com/topic/julian-calendar www.answers.com/topic/julian-calendar
Gregorian calendar - Wikipedia, the free encyclopedia
The Gregorian calendar is the internationally accepted civil calendar. It was first proposed by the Calabrian doctor Aloysius Lilius, and decreed by Pope Gregory XIII, after whom the calendar was na...
en.wikipedia.org/wiki/Gregorian_calendar
The converter at right will convert any date entered to the Ordinal date, sometimes referred incorrectly as the "Julian date format". This format is not the true Julian date, but is used to convert the days of the year to help when viewing data in ASCADS.
www.fs.fed.us/raws/book/julian.shtml www.fs.fed.us/raws/book/julian.shtml
Two main versions of the Christian calendar have existed in recent times: The Julian calendar and the Gregorian calendar. The difference between them lies in the way they approximate the length of the tropical year and their rules for calculating Easter.
www.webexhibits.org/calendars/calendar-christian.html www.webexhibits.org/calendars/calendar-christian.html
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An article about the nature and origin of the Julian day number system. ... Just as a Gregorian date is a date in the Gregorian Calendar, a Julian date is a date in the Julian Calendar. (For more on these calendars see The Julian and Gregorian Calendars).
www.hermetic.ch/cal_stud/jdn.htm
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 followed by October 15 in the new calendar, correcting for the accumulated discrepancy between the Julian calendar and the equinox as of that date.
www.fourmilab.ch/documents/calendar/ www.fourmilab.ch/documents/calendar/