Every advanced ancient civilization had astronomical observatories and political leaders routinely relied upon personnel at these facilities for information about when to plant and harvest crops. If your livelihood depends on this sort of thing, there may be an incentive to invest in improving instruments and models.
The artifacts that we have found represent a small fraction of what these people produced and used. Are there going to be any iPhones (or Commodore 64’s)that will survive to thousands of years from now? If so, will future archaeologists be able to turn one on?
