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'''Nychthemeron''' or nuchthemeron, (Greek: '' '''Νυχθημερόν'''''; nykt-"night", hemera-"day") is a full calendar day of twenty-four consecutive hours, night and day. The term is found in the [[New Testament]], in 2 Corinthians 11:25.

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 ''([[Vespers|hespera]]) '' began at the 11th hour, and with sunset came the first hour of night ''([[Compline|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>

==Other uses==In addition, The period of time known as the term is sometimes used especially in technical literature, to avoid the ambiguity inherent in the term ''daynychthemeron''. It is thus defined the period [[Daily Cycle]] of divine services of time prayer and worship that a calendar normally labels with a datepunctuates each liturgical day in the life of the Orthodox Church. {{stub}}