Trigger for Solar Noon

[AlexHuebi]

Hi there,
I was wondering if anyone has already figured out how to get a trigger, which, well, triggers at Solar Noon which is when the Sun passes the south, instead of the current Noon Trigger @time_trigger("once(noon)") which triggers at exactly 12:00.

[dbsdbs93]

The sun.sun entity has an azimuth attribute. Solar noon happens just around an azimuth of 180 every day. So you can do a trigger based on that.

[ALERTua]

I second this. You can rely on sun.sun attributes or at most you can try find an integration that provides the "solar noon" sensor.

[AlexHuebi]

There is also a sensor.sun_next_noon available which is a timestamp: '2025-07-06T11:07:17+00:00'. But I couldn't figure out, how to use that timestamp to trigger the function. Or at least my naive implementation wouldn't work.

I tried @time_trigger(sensor.sun_next_noon) which resulted in Can't parse 2025-07-29T11:09:02+00:00 in time_trigger check
And @time_trigger(f"once({sensor.sun_next_noon})") results in can't parse time offset t11:09:02+00:00

[craigbarratt]

The problem is those are ISO format timestamps, which as you noticed pyscript can't parse, unless you extract just the time of day. @dbsdbs93 proposed a good solution. To trigger once when the azimuth crosses 180 you could do this (untested):

@state_trigger("float(sun.sun.old.azimuth) < 180 <= float(sun.sun.azimuth)")

azimuth only updates every couple of minutes, so it won't be exact.

[AlexHuebi]

I tried that for today, and it worked like a charm. Thank you!

Although, might it be a possibility to get like a once(solarnoon) or similar trigger in the future?

In any case, thanks for your help!