which years were leap years ?

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https://www.thelists.org/list-of-leap-years.html

https://www.thelists.org/list-of-leap-years.html
List of Leap Years (1800-2100) – The Lists
The Gregorian Calendar: Origins and Evolution The Gregorian calendar, introduced by Pope Gregory XIII in 1582, was a refinement of the Julian calendar. Its primary purpose was to fix inaccuracies in the Julian system, caused by the miscalculation of leap years.
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https://miniwebtool.com/leap-years-list/?start_year=1900&end_year=2020

https://miniwebtool.com/leap-years-list/?start_year=1900&end_year=2020
List of Leap Years between 1900 and 2020 – MiniWebtool
2 oct. 2023But how can you quickly identify which years are leap years? The Leap Years List Tool is here to help. This tool is used to list all leap years between two years (from 1600 to 4000). What is a Leap Year? A leap year is a special year containing an extra day, making it 366 days long instead of the usual 365 days.

https://sciencestruck.com / list-of-leap-years

https://sciencestruck.com / list-of-leap-years
List of Leap Years – Science Struck
A list of leap years from the year 1800 to 2400, with the exception of 1900 and 2100. Learn about the history and origin of the Gregorian calendar, the types of years, and the history of the calendar. Find out which years were leap years and why.

https://en.wikipedia.org/wiki/Leap_year

https://en.wikipedia.org/wiki/Leap_year
Leap year – Wikipedia
Every year that is exactly divisible by four is a leap year, except for years that are exactly divisible by 100, but these centurial years are leap years if they are exactly divisible by 400. For example, the years 1700, 1800, and 1900 are not leap years, but the years 1600 and 2000 are. [8]

https://www.timeanddate.com/date/leapyear.html

https://www.timeanddate.com/date/leapyear.html
Leap Year 2024 – timeanddate.com
Leap years are years where an extra day is added to the end of the shortest month, February. This so-called intercalary day, February 29, is commonly referred to as leap day. Leap years have 366 days instead of the usual 365 days and occur almost every four years. What is a leap second? Is 2024 a ? Yes, 2024 is a .

https://www.history.com/news/why-do-we-have-leap-year

https://www.history.com/news/why-do-we-have-leap-year
5 Things You May Not Know About Leap Day | HISTORY
Nearly every four years, we add an extra day to the calendar in the form of February 29, also known as Leap Day. Put simply, these additional 24 hours are built into the calendar to ensure that…

https://spaceplace.nasa.gov/leap-year/en

https://spaceplace.nasa.gov/leap-year/en
What Is a Leap Year? | NASA Space Place – NASA Science for Kids
22 déc. 2023A leap year is a year that has 366 days instead of 365, because it takes Earth approximately 365.25 days to orbit the Sun. Learn why we have leap years, how they match the solar year, and how they are different for other planets.

https://www.livescience.com/45768-gregorian-calendar.html

https://www.livescience.com/45768-gregorian-calendar.html
Keeping Time: Leap Years and the Gregorian Calendar
So, for example, the years 2000 and 1600 were leap years, but not 1900, 1800 or 1700. While in a 2000-year period, the Julian calendar had 500 leap years, the Gregorian calendar only has 485.

https://www.thoughtco.com/history-of-leap-year-1989846

https://www.thoughtco.com/history-of-leap-year-1989846
The History of Leap Year – ThoughtCo
Leap years are necessary because the actual length of a year is nearly 365.25 days, not 365 days as commonly stated. Leap years occur every four years, and years that are evenly divisible by four (2020, for example) have 366 days. This extra day is added to the calendar on February 29.

https://www.mathsisfun.com/leap-years.html

https://www.mathsisfun.com/leap-years.html
Leap Years – Math is Fun
So every 4th year we add an extra day (the 29th of February), which makes 365.25 days a year. This is fairly close, but is wrong by about 1 day every 100 years. So every 100 years we don’t have a leap year, and that gets us 365.24 days per year (1 day less in 100 year = -0.01 days per year). Closer, but still not accurate enough! lesoutrali bot