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List of leap years5/7/2023 The ancient Roman Calendar added an extra month every few years to stay in sync with the seasons, similar to the Chinese leap month. This was not corrected until the introduction of the Gregorian calendar more than 1500 years later, when a number of days were skipped to realign our calendar with the seasons. The day of the week that a date falls on usually skips forward one. This formula produced too many leap years, causing the Julian calendar to drift apart from the tropical year at a rate of 1 day per 128 years. 1900, 1972, 1956, 1946, 1992, 1886, 1420, 1600. The Julian calendar, which was named after him, had only one rule: any year evenly divisible by four would be a leap year. Leap years in the western calendar were first introduced over 2000 years ago by Roman general Julius Caesar. Roman general Julius Caesar first introduced leap years. The next time the third criterion takes effect will be the year 2400. However, only a handful of countries had adopted the Gregorian calendar then, and the rest of the world was still using the Julian calendar. Of course, the same can be said about the year 1600. The number 2000 is evenly divisible by 400, so it was a leap year even though it can also be evenly divided by 100. The year 2000 was the first time the third criterion was used in most parts of the world since the transition from the Julian calendar to the Gregorian calendar, which began in 1582. It's still not perfect, but the resulting deviation is very small. Method 1: Using Iteration Check whether year is a multiple of 4 and not multiple of 100 or year is multiple of 400. Let’s discuss certain ways in which this can be performed. The Gregorian calendar addresses this by employing a slightly more complicated set of rules to determine which years are leap years. The problem of finding leap year is quite generic and we might face the issue of finding the number of leap years in given list of years. However, the deviation between the common year and the tropical year is a little less than 6 hours. The deviation would grow to exactly 24 hours over 4 years, and Earth would need exactly one day to catch up to the position in its orbit where it was 4 years prior. If the tropical year was precisely 6 hours longer than a calendar year with 365 days, we could use the Julian calendar, which adds a leap day every 4 years without exception. Why Don't We Add a Leap Day Every 4 Years? Leap days give the Earth time to catch up with our calendar. Leap days fix that error by giving Earth the additional time it needs to complete a full circle around the Sun.Įxact timings for spring, summer, fall, and winter Allow this to happen for a while, and Northern Hemisphere dwellers will be celebrating Christmas in the middle of summer in a matter of a few centuries. With a deviation of approximately 6 hours per year, the seasons would shift by about 24 calendar days within 100 years. If we didn't add a leap day on February 29 almost every four years, each calendar year would begin about 6 hours earlier in relation to Earth's revolution around the Sun (see illustration).Īs a consequence, our time reckoning would slowly drift apart from the tropical year and get increasingly out of sync with the seasons. However, the Gregorian calendar has only 365 days in a year. This is called a tropical year, and it starts on the March equinox. It takes Earth approximately 365.242189 days, or 365 days, 5 hours, 48 minutes, and 45 seconds, to circle once around the Sun. Leap days keep our calendar in alignment with Earth's revolutions around the Sun. While 1800, 1900, 2100, 2200, 2300, and 2500 are not leap years. How to know if it is a Leap Year: yes, Leap Years are any year that can be exactly divided by 4 (such as 2016, 2020, 2024, etc) not, except if it can be. Then it is a leap year.Īccording to these rules, the years 20 are leap years, The year is also evenly divisible by 400. If the year can also be evenly divided by 100, it is not a leap year In our modern-day Gregorian calendar, three criteria must be taken into account to identify leap years: Leap Year Rules: How to Calculate Leap Years What is a leap second? Is 2022 a Leap Year? Leap years have 366 days instead of the usual 365 days and occur almost every four years. This so-called intercalary day, February 29, is commonly referred to as leap day. Leap years are years where an extra day is added to the end of the shortest month, February. Business Date to Date (exclude holidays)Ī common year (non-leap year) is shorter than a tropical year, which is the time it takes the Earth to orbit the Sun.
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