Westlife - I Have a Dream/seasons in the sun. :)
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From 1901 to 2001, this century was called the Twentieth century. This is because the first century did not begin in the year of Zero. It began at the year of one. Thus the first century ended on January 1, the century of one.
15th century its always one more than the year lk 1870 would be 19th century 1950 was 20th century
20th is a linguistic ordinal number (first, second, third, etc). It cannot be represented as a Roman numeral which is strictly cardinal. Using cardinals, one way it might be represented is: "Century XX" Although the new millennium was celebrated on 1st January 2000, the 20th century didn't officially end until January 1st 2001. The year 2000 was the final year of the 20th century (years 1901-2000), and the first of the new millennium (years 2000 - 2999). Thus another way to notate the 20th century might be MCMI-MM (1901-2000).
Because zero refers to nothing. That is basic mathematics. To say the year zero is a contradiction, because a year is something, so it cannot have the number zero and then have the second year as one. You do not have the zero of any thing. Thinking there was a year zero led to the common misconception that the 20th century and 2nd millennium ended on the 31st of December 1999 and the new century and millennium began on the 1st of January 2000. The truth is that 2000 was the last year of the last century and last millennium and 2001 was the first year of the current century and millennium. However there was no year zero, just like there is no zero day of a month. You go straight from the end of one month into the beginning of the next. There is no day between them. So immediately after 1 BC was 1AD not 0AD, because zero means nothing.
You may be referring to the way the 1900s were called the 20th century for example. First, the 1900s are slightly out of alignment with the 20th century which is why people confuse them. You are not referring to the same years. So the 1900s refers to 1900 to 1999 whereas the 20th century refers to 1901 to 2000. Both are correct in their own right in talking about the 1900s or talking about the 20th century, but they do not refer to the same years. The 19th century and the 1900s are completely different, as the 19th century was 1801 to 1900, so had only one year in common with the 1900s, namely the year 1900. The 20th century is the 20th group of 100 years, so it ended at 2000. If the century and the the digits they start with were the same, I.E. the 19th Century was the years 1900 to 1999, then by default the 1st Century would have to be the years 100 to 199. If that were the case, then what would the year 1 to 99 be called, the Zero Century? Also, it would only be 99 years, as there was no year zero. The first century was year 1 to year 100. It didn't start with year 100 or the mythical year zero. The 2nd century was the second group of 100 years, so from 101 to 200. We are now in the 21st century, which is the 21st group of 100 years, so it runs from 2001 to 2100. People will refer to 2000 to 2099 as the 2000s.