What this unit was
Egyptian civil day is modelled here as a time standard of the Egyptian civil calendar tradition, associated with Egypt during Pharaonic civil calendar. The converter represents one sw as 86400 s; its basis is day-count-comparison. This is a defined or exact matrix anchor.
Within that setting, the unit belonged to a working system for civil scheduling, ritual or administrative cycles, and astronomical calculation. It should be read with its period, locality, and evidential basis attached, not as a universal value shared by every culture using a similar name.
Evidence of use and sources
The working value is traceable to UCL Digital Egypt, calendar. Its record is classified as high confidence and uses the stated basis rather than an assumed culture-wide constant.
Three directly pertinent excerpts from the supplied library are available.
“Finally the royal cubit of 28 digits”
Flinders Petrie, Ancient Weights and Measures, PDF p. 48. Egyptian linear subdivision
“These various lengths are evidently other standards”
Flinders Petrie, Ancient Weights and Measures, PDF p. 48. coexisting standards
“they us'd two sorts of Cubits”
Tables of antient coins, weights, and measures, PDF p. 95. historical cubit variation
Working definition
Egyptian civil day is represented as a Egyptian civil calendar standard associated with Egypt during Pharaonic civil calendar.
The converter uses 86400 s per unit.
How to use it
Basis: day-count-comparison; confidence: high. A shared historical name does not make this value portable to another period or polity.
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