Ancient Roman timekeeping.
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More:
https://www.thehourglass.com/cultura...he-roman-army/
Previously:
https://www.homemadetools.net/forum/...555#post197268
https://www.homemadetools.net/forum/...026#post221128
https://www.homemadetools.net/forum/...023#post187444
https://www.homemadetools.net/forum/...250#post214858
https://www.homemadetools.net/forum/...152#post191696
