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This Wikipedia page provides a comprehensive list of decades, centuries, and millennia.
Y2K is a numeronym and was the common abbreviation for the year 2000 software problem. The abbreviation combines the letter Y for "year", the number 2 and a capitalized version of k for the SI unit prefix kilo meaning 1000; hence, 2K signifies 2000.
From top left, clockwise: in 1492, Christopher Columbus reaches the New World, opening the European colonization of the Americas; the American Revolution, one of the late 1700s Enlightenment-inspired Atlantic Revolutions; the Ottoman conquest of Constantinople; the Atomic Bomb from World War II; an alternate source of light, the light bulb; for the first time, a human being sets foot on the ...
On 5 January 1975, the 12-bit field that had been used for dates in the TOPS-10 operating system for DEC PDP-10 computers overflowed, in a bug known as "DATE75". The field value was calculated by taking the number of years since 1964, multiplying by 12, adding the number of months since January, multiplying by 31, and adding the number of days since the start of the month; putting 2 12 − 1 ...
A millennium (pl. millennia or millenniums) is a period of one thousand years or one hundred decades or ten centuries, [1] [2] sometimes called a kiloannum (ka), or kiloyear (ky).
To make it into 365.2422 days, the calendar needs a leap year rule that a leap day should be added every year which is a multiple of 4 and not a century year + every year which is a quarter-century year (i.e. a multiple of 250) + every year which is a quarter-decamillennium year (i.e. a multiple of 2500): thus the years 250, 750, 1250, 1750 ...
In contemporary history, the third millennium is the current millennium in the Anno Domini or Common Era, under the Gregorian calendar.It began on 1 January 2001 and will end on 31 December 3000 (), spanning the 21st to 30th centuries.
Depending on context (i.e. language, culture, region, ...) some large numbers have names that allow for describing large quantities in a textual form; not mathematical.For very large values, the text is generally shorter than a decimal numeric representation although longer than scientific notation.