Increase/decrease in length of the day

[Dan Hinckley]

Before I try to cook it up myself, has anyone developed a way to show how much longer/shorter today is than the previous day?

[michael.k...@gmx.at]

I don't know if you can obtain the value directly, but you should be able to do it based on almanac

https://weewx.com/docs/5.1/custom/cheetah-generator/?h=almanac#almanac

when you subtract today's value from yesterday's, you have the delta.

https://groups.google.com/u/0/g/weewx-user/c/iRbj9wXsHHE/m/ZWhB5l45AgAJ

[Tom Keffer]

The standard "Seasons" skin already includes that. It's implemented using the following, which you can put in your skin. You need pyephem for it to work.

  ## For the change in daylight, pick a string to indicate whether it is more or
  ## less than yesterday:
  #set $sun_visible_change = $almanac.sun.visible_change
  #if $sun_visible_change.raw < 0
    #set $change_str = $gettext("less than yesterday")
  #else
    #set $change_str = $gettext("more than yesterday")
  #end if
#end if

This is then used in a table:

<tr>
  <td class="label">$gettext("Total daylight")</td>
  <td class="data">$almanac.sun.visible.long_form<br/>$sun_visible_change.long_form $change_str</td>
</tr>

On Fri, Jan 17, 2025 at 5:24 AM Dan Hinckley <d...@suiattle.org> wrote:

Before I try to cook it up myself, has anyone developed a way to show how much longer/shorter today is than the previous day?

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[weather list]

Thanks Tom, perfect.

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[weather list]

Actually, I'd like to say "Today is xx minutes longer/shorter than yesterday."

Is $sun_visible_change.raw expressed in minutes or seconds?

On 17 Jan, 2025, at 09:19, Tom Keffer <tke...@gmail.com> wrote:

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[Tom Keffer]

Almost everything in WeeWX is in seconds. The only exception that I can think of right now is the archive interval stored in the database, which is in minutes.

-tk

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[weather list]

Your example did what I need, I just hadn't put it in properly; now working. Thank you.

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[DR]

Is there an ideal or best place to insert this code for generating the data?

The table display portion is obvious to me, but wonder where this is best inserted? Thanks.  Dale

[Vince Skahan]

Not understanding what you're trying to accomplish with such skeletal wording.

There's no "best".  Whatever gets you the result you want is best.

[DR]

As I read it, the code for determining length of day and the selection
of longer or shorter boilerplate phrase needs to be done once a day.


To me, best is making sure the code gets executed near the beginning of
each day, but not run more than needed.  So putting it inside the
reading of loop packets is wasteful, which is as you've said not as much
of a problem as it used to be with the faster processors now.


Let me ask:  Are you running this code to do this additional tweak to
make WeeWx even nicer?  If you are, where did you put your snippet,
efficient or not?


The table display, as I mentioned, belongs in the current.inc, but I
don't know where to put the other code.  Can you help?  If you don't run
this add  in, but have a guess as to where it might be evaluated, can
you share?

Dale

[Vince Skahan]

If you surf the belchertown-new github you will find a file daylight.inc that works for me. It is included by one line in index.html.tmpl

You can take the same approach with whatever skin you wish to add 

(https://github.com/uajqq/weewx-belchertown-new/blob/master/skins/new-belchertown/daylight.inc)

[DR]

Thanks, I'm off to see if it will work for me.

I take it from the message by Tom Keffer that his solution didn't depend
upon Belchertown being installed, but perhaps the  info you refer to
will clarify for me. Again, thanks. Dale

[Tom Keffer]

The snippet I posted requires only that pyephem be installed. Everything else comes with generic WeeWX. The snippet can be included anywhere.

I should note that my cut-and-paste wasn't chosen very well. The Cheetah logic includes a closing "#end if", but not the opening "#if". The correct snippet would look like:

## If extended almanac information is available, calculate change in daylight.
#if $almanac.hasExtras

  ## For the change in daylight, pick a string to indicate whether it is more or
  ## less than yesterday:
  #set $sun_visible_change = $almanac.sun.visible_change
  #if $sun_visible_change.raw < 0
    #set $change_str = $gettext("less than yesterday")
  #else
    #set $change_str = $gettext("more than yesterday")
  #end if
#end if

The HTML is as before.

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