Question

why instead of BC or AD we add circa with some dates? ​

Answer 1

Answer:

Often dates will be preceded with a "c." or a "ca." These are abbreviations of the Latin word "circa" which means around, or approximately. We use this before a date to indicate that we do not know exactly when something happened, so c. 400 B.C.E.

Explanation:

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Answer 2

Answer:

Bc means before Christ

ad means Anno domini

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