How many BC years were there?

Answer 1

The age of the Earth is approximately 4.55 billion years old. "BC" or known academically as "BCE" for " Before common era" started 2010 years ago. So using this calendar system, the number of "BC years" is 4.55 billion years - 2,010 years which is still about 4.55 billion years when you round the numbers. The fact is, we can get a pretty good idea of how old the earth is plus/minus a few hundred million years. So when we have an uncertainty of 100 million years, subtracting or adding 2,010 years is kind of meaningless. It's like me asking you when you went on vacation last. You may answer "2 months ago". If I ask you how long since the night before your last vacation, you would still answer "2 months ago" since you would find it pointless to add 8 hours to that time.

Answer 2

"BC years" refer to years before the common era, so the number of BC years is based on how far back one goes in history. For example, 500 BC means 500 years before the common era.

Answer 3

6 thousand at least.