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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