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  2. Leap year problem - Wikipedia

    en.wikipedia.org/wiki/Leap_year_problem

    The leap year problem (also known as the leap year bug or the leap day bug) is a problem for both digital (computer-related) and non-digital documentation and data storage situations which results from errors in the calculation of which years are leap years, or from manipulating dates without regard to the difference between leap years and common years.

  3. Leap year - Wikipedia

    en.wikipedia.org/wiki/Leap_year

    A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) compared to a common year. The 366th day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year . [ 1 ]

  4. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    The formulae can be used proleptically, but "Year 0" is in fact year 1 BC (see astronomical year numbering). The Julian calendar is in fact proleptic right up to 1 March AD 4 owing to mismanagement in Rome (but not Egypt) in the period since the calendar was put into effect on 1 January 45 BC (which was not a leap year).

  5. Caesar created a new Julian calendar for Rome that measured a year as 365.25 days long, as the original Roman year was 10 days shorter than a modern year. The seasons were thrown off as a result ...

  6. 2024 is a leap year, but why? Here’s the science behind the ...

    www.aol.com/news/2024-leap-why-science-behind...

    A year may be a leap year if it is evenly divisible by 4. Years divisible by 100 (century years such as 1900 or 2000) cannot be leap years unless they are also divisible by 400. (For this reason ...

  7. Is 2024 a leap year? When is leap day, and why is it needed?

    www.aol.com/2024-leap-leap-day-why-204215160.html

    A leap year is a year in which an extra day, Feb. 29, is added to the calendar. It's called an intercalary day. It occurs about every four years, but there are exceptions (we'll get to that later

  8. 365-day calendar - Wikipedia

    en.wikipedia.org/wiki/365-day_calendar

    Some versions of the Zoroastrian calendar also use a fixed length of 365 days with no rule for leap days, despite potential leap year rules being acknowledged by the 9th century at the latest. In particular, of the versions still in use today the Qadimi version does not have any form of leap rule; the Shahanshahi version had one leap month ...

  9. 2024 is a leap year. Here's what that means — and why we ...

    www.aol.com/news/2024-leap-heres-means-why...

    👽 Do other planets have leap years? Yes, Martians are also thrown for a loop on Mars. “Sols” are Martian days, so a year on Mars is 668 sols. But it takes Mars 668.6 sols to travel around ...