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Thus, the day of the week can be obtained from the remainder of the division of the Julian date by 7.Calendar dates — year, month, and day — are more problematic.Note that the time scale that is the basis for Julian dates is Universal Time, and that 0h UT corresponds to a Julian date fraction of 0.5.It is assumed that 7-day weeks have formed an uninterrupted sequence since ancient times.As used here, the two calendars have identical month names and number of days in each month, and differ only in the rule for leap years.The Julian calendar has a leap year every fourth year, while the Gregorian calendar has a leap year every fourth year except century years not exactly divisible by 400.Thus, there is a ten-day gap in calendar dates, but no discontinuity in Julian dates or days of the week: 4 October 1582 (Julian) is a Thursday, which begins at JD 2299159.5; and 15 October 1582 (Gregorian) is a Friday, which begins at JD 2299160.5.The omission of ten days of calendar dates was necessitated by the astronomical error built up by the Julian calendar over its many centuries of use, due to its too-frequent leap years.
Typically, a 64-bit floating point (double precision) variable can represent an epoch expressed as a Julian date to about 1 millisecond precision.
The changeover to the Gregorian calendar system occurred as described above only in Roman Catholic countries.
However, adoption of the Gregorian calendar in the rest of the world progressed slowly. Seidelmann, University Science Books, 2012); the "Calendars" chapter by L. Doggett, which appeared in the 1992 edition, can also be helpful.
Among other things, it can be used to find how many days old you are and the weekday you were born.
We met following a weekend that Beth was away with a group of couples and had had enough with 'the single life' and decided she would go on a date with 'the next half decent guy' that sent her a message on RSVP.