indiction
noun
a proclamation made every 15 years in the later Roman Empire, fixing the valuation of property to be used as a basis for taxation.
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The Julian epoch, based on the coincidence of the solar, lunar, and indictional periods, is fixed at 4713 B.C., and is the only epoch established on an astronomical basis.
From The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura by Various