Danna (Mesopotamian)
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Danna (Sumerian) or Beru (Akkadian) is a word denoting a unit of time consisting of two hours. There were twelve Danna in a day. Danna were first used around 2400 BC.


Change in length and decline

In Hellenistic times the Danna was halved with the introduction of the temporal hours and the number of daylight hours increased from twelve to twenty-four. The conversion was based on the ancient Egyptian precursors of the 24 seasonally - equal hours. A 24-hour division of the day could not be proven in inscriptions on Babylonian tablets, which is why the Babylonians cannot be used as the originators of the 24-hour division of the day.Vgl. Friedrich-Karl Ginzel: ''Handbuch der mathematischen und technischen Chronologie, Bd. 1 - Zeitrechnung der Babylonier, Ägypter, Mohammedaner, Perser, Inder, Südostasiaten, Chinesen, Japaner und Zentralamerikaner -'', Deutsche Buch-Ex- und Import, Leipzig 1958 (Nachdruck Leipzig 1906), S. 123.


See also

*
Unequal hours Unequal hours are the division of the Daytime, light day and the night into 12 sections each, whatever the season. They are also called temporal hours, seasonal hours, biblical or Jewish hours, as well as ancient or Roman hours (). They are ''une ...
*
Equinoctial hours An equinoctial hour is one of the 24 parts of the full day consisting of light day and the night. Its length, unlike the temporal hour, ''does not'' vary with the season, but is constant. The measurement of the full day with equinoctial hours o ...


References

{{reflist History of timekeeping