Subj : Re: Daylight Savings
To   : Adept
From : Ed Vance
Date : Tue Mar 25 2025 04:12 pm



> Evidently it'll happen in 2028. If you're in Chicago, but not if you're in
> Germany.

> That said, this is the reason for having a leap day, and for eventually
> skipping leap day in the divisible-by-100 year, but not the divisible-by-400
> year.

> But, e.g., Chicago has these times, for Spring equinoxes:
> 2025 - 3/20 04:01
> 2026 - 3/20 09:45
> 2027 - 3/20 15:24
> 2028 - 3/19 21:17
> 2029 - 3/20 03:01
> 2030 - 3/20 08:51
> 2031 - 3/20 14:40
> 2032 - 3/19 20:21

> Had we skipped leap day in 2000, it'd still mostly be on the 21st, with going
> to the 20th every 4 years.

> But we creep forward about an hour on the calendar every 4 years, with the
> leap day included.

> Thus why it takes about 24 of those cycles for it to be reasonable to skip a
> leap day. That's not quite 25 (and thus a century), and I'm guessing it's
> probably actually about 22 cycles. That said, that's just me going backwards
> on the math and assuming the people who made the calendar had the right
> ideas, for why we have leap days when we do.

> --- Mystic BBS v1.12 A48 (Linux/64)
>  * Origin: Storm BBS (21:2/108)


THANKS A BUNCH FOR GOING TO THAT TROUBLE!!!
 Good explanation too!
Ed
--- SBBSecho 3.20-Linux
 * Origin: capitolcityonline.net * Telnet/SSH:2022/HTTP (21:1/175)

.