Check this site.
http://www.vroma.org/~bmcmanus/circus.html
How were Roman chariot races like horse races today?
4 answers
how can i find out what day of the week December 19,1777 was
http://www.hf.rim.or.jp/~kaji/cal/cal.cgi?1777
http://www.searchforancestors.com/utility/dayofweek.html