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  2. List of photographs considered the most important - Wikipedia

    en.wikipedia.org/wiki/List_of_photographs...

    This is a list of photographs considered the most important in surveys where authoritative sources review the history of the medium not limited by time period, region, genre, topic, or other specific criteria. These images may be referred to as the most important, most iconic, or most influential—but they are all considered key images in the ...

  3. 1800 - Wikipedia

    en.wikipedia.org/wiki/1800

    1800 was an exceptional common year starting on Wednesday of the Gregorian calendar and a leap year starting on Sunday of the Julian calendar, the 1800th year of the Common Era (CE) and Anno Domini (AD) designations, the 800th year of the 2nd millennium, the 100th and last year of the 18th century, and the 1st year of the 1800s decade. As of ...

  4. Leap year - Wikipedia

    en.wikipedia.org/wiki/Leap_year

    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] 1800 calendar, showing that February had only 28 days

  5. What is a leap year? Everything to know about February's ...

    www.aol.com/news/leap-everything-know-februarys...

    Here's the confusing part: According to the NIST, century leap years are only leap years if they can be evenly divided by 400. So, for example, 1700, 1800 and 1900 weren't leap years. And 2100?

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

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

    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, the years 1700, 1800, and 1900 were not leap years, but ...

  7. Why We Have Leap Years - AOL

    www.aol.com/why-leap-years-184323412.html

    That resulted in the years 1700, 1800, and 1900 losing their leap day, but 2000 adding one. Every other fourth year in all of these centuries would get it's Feb. 29. And with that the calendrical ...

  8. Bissextus - Wikipedia

    en.wikipedia.org/wiki/Bissextus

    That the several Years of our Lord, 1800, 1900, 2100, 2200, 2300, or any other hundredth Years of our Lord, which shall happen in Time to come, except only every fourth hundredth [sic] Year of our Lord, whereof the Year of our Lord 2000 shall be the first, shall not be esteemed or taken to be Bissextile or Leap Years, but shall be taken to be ...

  9. Why do we have a leap year? What would happen if we didn’t ...

    www.aol.com/why-leap-happen-didn-t-130000847.html

    Getty Images. Check your calendars, California. ... To cover the 12 cycles of the moon, the king added 56 days to the 298. ... The next time a leap year will be skipped is in 2100, Craddock said.