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Every year has exactly 52 weeks divided in 13 months. Each month has exactly 28 days divided in 4 weeks. Every day of the month falls on the same weekday in each month (i.e. the 17th always falls on a Wednesday). The calendar is the same every year (perennial), unlike the annual Gregorian calendar, which differs from year to year.
When keeping the traditional dozen months and the close approximation of a solar year, this usually yields four equal quarters of three months each where one month is longer than the other two. World Calendar and Hanke–Henry Permanent Calendar follow this with 31:30:30 and 30:30:31 days per month, respectively.
Gregory's calendar reform modified the Julian rule, to reduce the average length of the calendar year from 365.25 days to 365.2425 days and thus corrected the Julian calendar's drift against the solar year: the Gregorian calendar gains just 0.1 day over 400 years. For any given event during the years from 1901 through 2099, its date according ...
Each year typically has 365 days, but every four years, the calendar tacks on an extra day to the end of February, the shortest month of the year, and gives it 366.
January 0 is the day before January 1 in an annual ephemeris. It keeps the date in the year for which the ephemeris was published, thus avoiding any reference to the previous year, even though it is the same day as December 31 of the previous year. January 0 also occurs in the epoch for the ephemeris second, "1900 January 0 at 12 hours ...
A year zero does not exist in the Anno Domini (AD) calendar year system commonly used to number years in the Gregorian calendar (nor in its predecessor, the Julian calendar); in this system, the year 1 BC is followed directly by year AD 1 (which is the year of the epoch of the era).
Time flies when you're having fun—or just simply existing in February, the shortest month of the year!. Every year, the monotonous pattern of 30 or 31-day months is broken up by the short and ...
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