<P> The expression has been traced back to 1615 , when it first appeared in a book by Johannes Kepler as the Latin usage vulgaris aerae , and to 1635 in English as `` Vulgar Era '' . The term `` Common Era '' can be found in English as early as 1708 , and became more widely used in the mid-19th century by Jewish academics . In the later 20th century , the use of CE and BCE was popularized in academic and scientific publications , and more generally by authors and publishers wishing to emphasize secularism or sensitivity to non-Christians , by not explicitly referencing Jesus as `` Christ '' and Dominus ( `` Lord '' ) through use of the abbreviation `` AD '' . </P>
<P> The expression has been traced back to 1615 , when it first appeared in a book by Johannes Kepler as the Latin usage vulgaris aerae , and to 1635 in English as `` Vulgar Era '' . The term `` Common Era '' can be found in English as early as 1708 , and became more widely used in the mid-19th century by Jewish academics . In the later 20th century , the use of CE and BCE was popularized in academic and scientific publications , and more generally by authors and publishers wishing to emphasize secularism or sensitivity to non-Christians , by not explicitly referencing Jesus as `` Christ '' and Dominus ( `` Lord '' ) through use of the abbreviation `` AD '' . </P>
when did we start using ce and bce
when did we start using ce and bce
1708
1708