Appendices and Indices Figures and Plates

@inproceedings{Neugebauer1975AppendicesAI,
  title={Appendices and Indices Figures and Plates},
  author={O. Neugebauer},
  year={1975}
}
The most essential requirement for any measuring unit is its constancy. In historical chronology, however, this condition is satisfied only in three cases: by the Egyptian years of 365 days, by the days themselves, counted consecutively as “julian days” beginning with day 0 = −4712 Jan. 1, and finally by the seven-day week. 

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