The Julian Period will last 7980 years, beginning each time a day in the Julian calendar when the Indiction, Golden Number, and Solar Number are all 1.
The Indiction was a cycle of 15 years introduced by emperor Constantine the Great on 1 September 312 AD and was used in the middle ages for cycles of taxation. It did not always follow the start of the calendar year, having various starting dates depending on the area of use.
The Golden Number is a cycle of 19 years wherein the phases of the moon realign with the solar year.
The Solar Number is a cycle of 28 years wherein the days of the week realign with the dates of the year.
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