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Nychthemeron

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Following Roman custom, the Byzantines began their calendrical day (''nychthemeron'') at midnight with the first hour of day (hemera) coming at dawn. The third hour marked midmorning, the sixth hour noon, and the ninth hour midafternoon. Evening (hespera) began at the 11th hour, and with sunset came the first hour of night (apodeipnon). The interval between sunset and sunrise (''nyx'') was similarly divided into 12 hours as well as the traditional "watches" (vigiliae) of Roman times.<ref>Prof. Dr. [http://aha.missouri.edu/people/rautman.html Marcus Louis Rautman]. "Time." In: '''[http://books.google.ca/books?id=hs3iEyVRHKsC&printsec=frontcover&source=gbs_navlinks_s Daily Life in the Byzantine Empire]'''. Greenwood Publishing Group, 2006. p.3.</ref>
In addition , the term is sometimes used, especially in technical literature, to avoid the ambiguity inherent in the term ''day''. It is the period of time that a calendar normally labels with a date.
==See also==
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