What this unit was
Egyptian royal cubit (New Kingdom rod) is modelled here as a length standard of the Egyptian tradition, associated with Egypt during New Kingdom around 1550 to 1070 BCE. The converter represents one rc as 0.525 m; its basis is artefact-measured. The matrix carries an indicative uncertainty of ± 0.001 m.
Within that setting, the unit belonged to a working system for survey, building, travel, and the organisation of built space. 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 British Museum EA23078. 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 royal cubit (New Kingdom rod) is modelled here as a Egyptian length standard associated with Egypt and New Kingdom around 1550 to 1070 BCE. The converter uses a representative value of 0.525 m per unit.
How to use it
This value is a contextual research aid, not a universal ruler. Its basis is recorded as artefact measured with high confidence. Surviving seven-palm wooden rod measured at 52.50 cm
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Next phase
This page will be expanded with source discussion, chronology, evidence, uncertainty notes, and worked examples.