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Why is the year 2000 called the twenty first century?
The years 0-99 are referred to as the 1st century. The 1900's were referred to as the 20th century and therefore the year 2000 was referred to as the twenty first century. Sorry if this explanation doesn't make much sense or doesn't answer your question correctly.
What century was the year 79?
The year 79 A.D. was in the First Century. Years 0 to 99 AD were in the first century after the start of the calendar (supposedly the death of Christ) - hence the First Century.
How first order derivative zero in differential equations?
Well, 0 is a constant, so the derivative of 0(, or any other constant) is 0. This information is coming from an 11 year old kid.
Did the year start from one?
Yes, the first year of our current systems was 1AD. There was no year zero. Zero is nothing, so it cannot have something attached to it. 1BC preceded 1AD. There was no year in between these two. It is just like there is no day between the last day of one month and the first day of the next month. Right from the 1st of January 1AD we were in the year 1AD though the year was not complete until it ended. Your starting point of zero was at the very beginning of the year. The year prior to that zero point was the year immediately before it, so there is no intervening year. We went from 1BC to 1AD, not from 1BC to year 0 to 1AD.
What year did the 20th century start?
the 20th century started in 1901. The first full 1900 years (19 centuries) included 1900, because there was no year 0.
