since, literally, the begining of time. within the tiniest split second of the big bang, quarks were created, which are spherical, and of course a sphere is a three dimensional circle
Since 1 A.D. Christ's death was what made the change in the calendar.
88 Days
how long has deforestation been around
As long as guns have been around.
how long has the london eye been around for
As long as So Random has been around.
234 years fool
how long have boxing been around?
boner
They have always been around
The Jewish answer is that the Babylonians did not change the Jewish faith. Our traditions, which we still keep, have been around since long before the Babylonian exile.
People have been drawing circles for a very long time.