BC means before Christ and when Christ was born, they couldn't call it before Christ. that when they changed it to AD, which stands for Anno Domini, roughly translated into year of our lord. Fairly self explanatory. BC = Before Christ. AD = Anno (Year of) Domini (The Lord (Christ)). The change was the roman pinpoint of the birth of Christ. It is chronologically inaccurate but the world reference nonetheless.
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Okay Will AD is older than BC because AD is very old not like BC
It isn't a question of closer to ad or bc, it IS bc. 3000bc would be -3000ad.
BC= negative number AD= Positive number
BC comes before AD on a timeline. BC or BCE means before common era, AD means "In the year of Our Lord."BC first AD after
BC is "before Christ" and AD "anno domini"