Function card 

pub fn card(
    forecast: &Forecast,
    at: &Zoned,
    tr: &Translator,
) -> Option<WeatherView>

What the phone’s card shows of the weather at at (docs/android.md, “The card on the home screen”): the hour under way (“Now”), the next four hours, then the next four parts of the day that hold two hours of the forecast at least, each the next of its kind, in order: morning (6–12), afternoon (12–18), evening (18–24), night (0–6), named shortly (“Afternoon”, “Night”), since their order says which day they are. None when the forecast does not hold the hour under way.