[Remind-Fans] Chinese lunisolar calendar

[taekoocair at wilsonb.com]

Thank you Tim, your code is much more straightforward than I had anticipated.
Thanks for throwing that together!

> I've looked for source code or formulae for computing the solar terms
> and so far haven't found any, so I'd say it's unlikely I'd implement
> this unless someone contributes.

For posterity, this page seems to go into quite a bit of detail:

https://ytliu0.github.io/ChineseCalendar/rules.html#liuStephenson98a

There's some prose-code in Section 3.


Tim Chase via Remind-fans <remind-fans at lists.skoll.ca> wrote:
> On 2023-12-29 10:14, Remind list wrote:
> > On Fri, 29 Dec 2023 09:19:13 +0900
> > taekoocair--- via Remind-fans <remind-fans at lists.skoll.ca> wrote:
> > 
> > > Is there any reasonable way to encode the Chinese solar terms?
> > 
> > I would say not really in the Remind language itself.  The code Tim
> > Chase posted might be somewhat accurate (I have not tested it) but I
> > doubt it conforms to the official specifications.  The Earth's orbit
> > is elliptical, and I'm sure that messes with the calculations, though
> > probably not much as the eccentricity of the orbit is pretty low.
> 
> Yeah, the eccentricity may have been what squished my dates off by
> a day or two in either direction.  My test was to
> 
>   REM MSG Solar term: [$T] [angle_to_st($T)]
> 
> item and then
> 
>   $ rem \*365 | sed '/Reminders for/d' | less
> 
> and eyeball the transition dates compared to the Wikipedia table
> where they were all largely within a day of accurate.
> 
> -tim
> 
> 
> 
> 
> 
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