Thanks! Fortunately, the service which currently had a 'need to know' for
these times was already computing sunshine hours, and the algorithm for
that involves computing whether the sun is above or below the horizon, so I
just had to make that information available to the section of code that
needed it. I was asking mainly because I could imagine other situations
where it wasn't so easily available within the service.
On Sunday, March 26, 2023 at 6:54:11 PM UTC-4 Tom Keffer wrote:
> Unfortunately, no, there's no easy way to get at the searchlist instance
> that does almanac tags.
>
> Your best bet would be to create a private instance of
> weewx.almanac.Almanac and use that. That will require the time you want
> the almanac to be valid for and your position. Altitude is optional. These
> can be obtained from the engine. Something like this (NOT TESTED):
>
> import time
> import weewx.engine
> import weewx.almanac
>
> class MyService(weewx.engine.StdService):
> def __init__(self, engine, config_dict):
> super(MyService, self).__init__(engine, config_dict)
>
> latitude_f = engine.stn_info.latitude_f
> longitude_f = engine.stn_info.longitude_f
> altitude_vt = engine.stn_info.altitude_vt
>
> almanac = weewx.almanac.Almanac(time.time(), # The time
> you want to use
> latitude_f, # The
> latitude
> longitude_f, # The
> longitude
> altitude=altitude_vt) # The
> altitude as a ValueTuple (optional)
>
> print("Jupiter will rise at", almanac.jupiter.rise)
>
> The values can be further refined by adding the horizon angle, pressure,
> etc. See the initializer
> <https://github.com/weewx/weewx/blob/b5a79042fb5017c8c0d342e957ae1fa98040bd94/bin/weewx/almanac.py#L195>
>
> for Almanac, and the doctests for the class.
>
> Hopefully, that will get you started!
>
> -tk
>
>
> On Sun, Mar 26, 2023 at 1:36 PM 'Peter Fletcher' via weewx-development <
> [email protected]> wrote:
>
>> weewx obviously 'knows' the sunrise and sunset times for the current date
>> and location, since almost all available skins display them. Are their
>> values accessible from within a service?
>>
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