Many people find it difficult to answer the question: "How to determine the century by the year in which this or that event occurred?" In general, there is nothing complicated here. Now you will see it for yourself.
Our era
For events that occurred in the time period of our era (i.e. everything that happened from our days to a period of just over two thousand years ago), the century is calculated as follows: the last two digits are discarded from the year value, and one is added to the result. Suppose we need to find out in what century the Great Patriotic War began. This happened in 1941. We discard the last two digits (41) and add one to the remaining digits (19). It turns out the number 20. That is. The Great Patriotic War began in the 20th century. Another example - Prophetic Oleg died in 912. What century was it? We discard the numbers 12, add one to the nine and understand that the Kyiv prince died in the tenth century.
Here you need to make one clarification. A century is a span of one hundred years. If the last two digits of the year are 01, then this is the first year of the beginning of the century. If 00 is the last year of the century. Thus, there is an exception to our rule. If the last two digits of the year- zeros, then we do not add one. How to determine such a century by year? For example, Pius VII became Pope in 1800. In what century did this happen? We discard the last two digits of the date, but keep in mind that these are zeros, and do not add anything. We get 18. Pius VII became Pope in the 18th century. And the next year, the 19th century began. We figured out the definition of which century which year includes, relative to our era. What about events that happened before?
BC
It's a bit more complicated. From 1 year to 100 BC - this is the first century BC. From 101 to 200 - the second, and so on. Thus, to determine the century by the year before the birth of Christ, you must discard the last two digits of the year and add one. And in the same way, with the last digits in two zeros, we do not add anything. Example: Carthage was destroyed in 146 BC. e. How to determine the century by year in this case? We discard the last two digits (46) and add one. We get the second century BC. And let's not forget about our exception: catapults were invented in 400 BC. We discard the last two digits, keep in mind that these are zeros, and add nothing. It turns out that catapults were invented in the 4th century BC. It's simple!
Millennium
Since we figured out how to determine the century by year, let's try to learn how to determine the millennium at the same time. There is nothing complicated here either. Only you will have to discard not two, but three last digits of the date, but still add 1.
Example: Alexander IIabolished serfdom in 1861. In what millennium did he do this? We discard the last three digits (861) and add one more to the remaining unit. Answer: second millennium. There are exceptions here too. If the last three digits are zeros, then one is not added.
The national currency "somoni" was introduced in Tajikistan in 2000. That is, it happened in the second millennium.
That is why those who celebrated the beginning of the third millennium and the 21st century in 2000 were mistaken - these events took place only next year.
If you understood all this simple arithmetic, now you know exactly how to determine the century by year or even find out the number of the millennium.
