Using sunrise and sunset times within a service

[Peter Fletcher]

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?

[Tom Keffer]

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 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 <weewx-de...@googlegroups.com> 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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