[Remind-Fans] Calculating solar noon (was Re: sun moon data)

[Dianne Skoll]

On Fri, 18 Mar 2022 12:10:30 -0300
Sector11 via Remind-fans <remind-fans at lists.skoll.ca> wrote:

> I never thought to use TZ.
> Using TZ as shown do your also get:
> ----------
> Mittagssonne: 361
> ----------
> for solar noon?

I haven't tried, but probably.  If you substract one TIME from another,
the resulting value is an INT representing the difference in minutes.
So for example:

$ echo 'msg [18:20 - 06:20]' | remind -
720

$ echo 'msg [(18:20 - 06:20)/2]' | remind -
360

Solar Noon should probably be: [sunrise() + (sunset() - sunrise())/2]
Because it is: (lighttime-length/2) + sunrise.

Regards,

Dianne.