Talk:Year zero

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If a person was born in 30 B.C., what age does that person reach on birthday in 30 A.D.?

Answer: 59 (there is no year zero).

(Notice that people actually living back then would have been using a different system for year numbering, because they would not have known about Jesus.)

I figure that the Common Era uses repeating moths and days because, otherwise, Julius Cesar would not have died on the Ides of March, but ¿Which calendars are in the category of invariant days and month repeating?, and ¿which calendars have clocks, moths, and days run backawrs thus?:

-0th Year, -January -1st, -00:00:01

Zero-Time

+0th Year, +January +1st, +00:00:01

Originally, years were adjectives (1st year, second year, et cetera). This system is because, at the time, people did not know about 0. Cassini, being a mathematician, wanted 0. He may or may not have wanted 0-Time (a singularity of time), but he wanted to maintain the cycle of leap years. He defined the 0th year as the year-long duration containing the leap year before the year year of the positive 4th year. Because the system is based on durations of time instead of a temporal singularity of 0-Time, the 0th year is unsigned. The years work thus:

…, -1st year, 0th year, +1st year, …,

(subunits of the year (months days, days of the week, hours, minutes, seconds, et al) existed both before the calendar and before year # 0, so roll forward for negative dates instead of counting don to 0.

0 was a proleptic astronomic Gregorian year who started on a Saturday, its 1 January, and ended on a Sunday, its 31 December. It was equivalent to the Julian year 1 BC. 1 Shevat 3760 AM, the Hebraic date, was the date of the astronomic Gregorian 25 December 1 BCE (Julian 27 December 2 BC). Its 29 February was a Tuesday. 177.68.126.178 (talk) 20:05, 15 June 2022 (UTC)Reply

I would say the singer Chappell Roan is "increasingly popular" but I'm not sure that's an accurate way to describe the Human Era Calendar. 2601:602:C482:CB80:E994:A5EF:2E16:D3C9 (talk) 19:54, 2 January 2025 (UTC)Reply

The sentence you're talking about, in the current text, is problematic in multiple ways. In addition to the peacock phrasing, there's the fact that "the H.E. calendar" is not further explained, and is not mentioned in the body (the lead is supposed to be a summary of the body).

We do have an article on the Holocene calendar that could be linked to, if someone wanted to add something about it in the body of the article. I'm unsure whether mentioning it is worthwhile. I'm going to just remove the contested sentence. If someone else wants to mention the Holocene calendar (without appearing to promote it) I have no objection. --Trovatore (talk) 21:12, 2 January 2025 (UTC)Reply