400 - 24... 376
It depends on whether you believe that the fifth century starts in 400 or 401.
Remember, there was no year 0. So some people would argue that the first century began in the year 1, the second in the year 101, the third in the year 201, etc. Others would argue that this is just pedantic pretense.
So it's either 376 or 377, depending on how you count.
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The fifth century began on January 1, 401 AD, and ended on December 31, 500 AD. To determine how many years ago the fifth century was, we need to subtract the end year (500 AD) from the current year. As of 2023, the fifth century was 1523 years ago.
1666 AD resides in the 17th century. Unless the year ends in -00, you can add 1 to the first number if it is a three digit year and 1 to the first two numbers if it is a four digit year.For example, 411 AD is in the 5th century. This is a 3 digit year so take the first number, (4) and add (1), 4+1=5th Century.
487 BC
The concept of zero as a placeholder and numeral was invented around the 5th century CE in ancient India by mathematicians known as the Indian mathematicians. This idea spread to other civilizations and eventually reached Europe in the 12th century.
Possibly 5th Century BC