Each period consists of NUMBER@1 hours numbered NUMBER@1 -LRB- acting as zero -RRB- , NUMBER@2 , NUMBER@3 , NUMBER@4 , NUMBER@5 , NUMBER@6 , NUMBER@7 , NUMBER@8 , NUMBER@9 , NUMBER@10 , NUMBER@11 , and NUMBER@12 .

Both names are from Latin , and numbered from NUMBER@1 , NUMBER@2 , NUMBER@3 , NUMBER@4 , NUMBER@5 , NUMBER@6 , NUMBER@7 , NUMBER@8 , NUMBER@9 , NUMBER@10 , NUMBER@11 , and NUMBER@12 .
