The century for 561 bc, or more correctly 561 BC (also, BC is sometimes termed BCE)
is: The 6th century BC
The year 1500 BCE falls within the 16th century BCE. The centuries are counted backward in BCE (Before Common Era) dating, so the 1st century BCE spans from 100 BCE to 1 BCE, making the 16th century BCE cover the years from 1600 BCE to 1501 BCE. Thus, 1500 BCE is the last year of the 16th century BCE.
88 BCE is in the first century BC or BCE.
20th Century BCE.
The year 3000 BCE falls in the 30th century BCE, as the centuries are counted backward before the common era (CE). Each century consists of 100 years, so the 30th century BCE spans from 3100 BCE to 3001 BCE. Thus, 3000 BCE is the last year of the 30th century BCE.
The year 2737 BCE falls within the 28th century BCE. Centuries are counted backward in the BCE (Before Common Era) system, so the 28th century BCE includes the years from 2800 BCE to 2701 BCE. Therefore, 2737 BCE is part of this earlier century.
551 and 479 BCE
Confucis was born in September 28, 551 BCE and died sometime in 479 BCE. He lived in China.
The 13th century BCE.
The 4th century BCE.
The 14th Century BCE.
The year 1500 BCE falls within the 16th century BCE. The centuries are counted backward in BCE (Before Common Era) dating, so the 1st century BCE spans from 100 BCE to 1 BCE, making the 16th century BCE cover the years from 1600 BCE to 1501 BCE. Thus, 1500 BCE is the last year of the 16th century BCE.
88 BCE is in the first century BC or BCE.
20th Century BCE.
The year 3000 BCE falls in the 30th century BCE, as the centuries are counted backward before the common era (CE). Each century consists of 100 years, so the 30th century BCE spans from 3100 BCE to 3001 BCE. Thus, 3000 BCE is the last year of the 30th century BCE.
The year 2737 BCE falls within the 28th century BCE. Centuries are counted backward in the BCE (Before Common Era) system, so the 28th century BCE includes the years from 2800 BCE to 2701 BCE. Therefore, 2737 BCE is part of this earlier century.
Third century BCE
5721 BCE is the 58th century BCE.