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Old 02-08-2020, 02:30 PM
DPRK is offline
Join Date: May 2016
Posts: 4,736
Originally Posted by Northern Piper View Post
Why is January 1, 4713 the start point for Julian days? What event in Roman history does that link to?
Who says it dates an event? I always thought the idea was to set the origin back far enough so that all historical observations would have a positive day number.

One Julian period is supposed to be 28 x 19 x 15 years, and you supposedly get 4713 BC if you go back to when all three cycles were last synchronised at 1, though now that you mention it I ought to double-check that calculation (Scalinger's calculation is described in the Wiki article assuming that 1 bc was 9 in the solar cycle, 1 of the lunar cycle, and 3 in the 15-year indiction cycle.)

Last edited by DPRK; 02-08-2020 at 02:34 PM.