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Date: Fri, 17 Jan 2025 23:15:30 +0000
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On Fri, 17 Jan 2025 16:00:55 -0600, Physfitfreak wrote:

> 
> Even if you accurately count the number of days past since, say, the day 
> with date 1/17/1700, it won't mean you have all the information about 
> that day's correct location in that year; because, Earth's tilted axis 
> of rotation is not along a fixed direction. The axis wobbles, or 
> "precesses" all the time. So a historian who wrote down the date as 
> 1/17/1700 on that day, will slightly be in a different time of the year 
> compared to the present day's 1/17/2025.
> 
> As long as the difference falls below one day, this is not that 
> important. But if you go back farther in time to Darius's era, this 
> difference places you in a different season of the year. A historian who 
> according to your calculations would've written down the date 1/17/-1500 
> in his notes, was not on the January 17th of that year! He was in 
> another season of that year. Therefore your calculated result of 
> 1/17/-1500 is meaningless.
> 
> This may look a rather simple astronomy problem, but when you want to 
> program it, it gets tough sometimes. And there are options to take to 
> correct the discrepancies. I took the option of modifying the length of 
> a day just enough to take care of precession of the axis of rotation of 
> Earth, as well as of course its orbiting around the sun (which by itself 
> introduces one day of discrepancy per year.)
>

I understand what you are saying, but, unfortunately, I am not well
versed in astronomical calculations and thus I cannot competently
respond to your comments.

However, I do suspect that the problem of accurately rectifying Julian
dates to various solar/lunar calendars has been solved long ago.

We need input from the GNU/Linux "experts" on this NG but I believe
that the "experts" are only a bunch of fat-chewing ignoramuses that
cannot distinguish their asses from a hole in the ground.



-- 
Systemd: solving all the problems that you never knew you had.