I want to access Weather data in another addon - specifically sunset and sunrise times. Is this possible? If so, How?
everything is properties on the window.
http://wiki.xbmc.org/?title=InfoLabels (see under 15)
that being said, sunrise/sunset is not standard so it will be on a per-addon basis. they will also be there as properties, you'd have to dig into the addon source to see which it sets.
