If there seems to be a discrepancy with the dating on the construction then this quote might help explain Ra's position when it deals with the dates and estimation of years.
Quote:Ra: This is correct. Please continue to scan for errors having to do with numbering, as you call them, as this concept is foreign to us and we must translate, if you will, when using numbers. This is an on-going weakness of this contact due to the difference between our ways and yours. Your aid is appreciated.